text: Asterisk 13 is the next Long Term Support (LTS) release of Asterisk. As such, the focus of development for this release of Asterisk was on improving the usability and features developed in the previous Standard release, Asterisk 12. Beyond a general refinement of end user features, development focussed heavily on the Asterisk APIs - the Asterisk Manager Interface (AMI) and the Asterisk REST Interface (ARI) - and the PJSIP stack in Asterisk. Some highlights of the new features include:
  Asterisk security events are now provided via AMI, allowing end users to monitor their Asterisk system in real time for security related issues.
  External control of Message Waiting Indicators (MWI) through both AMI and ARI.
  Reception/transmission of out of call text messages using any supported channel driver/protocol stack through ARI.
  Resource List Server support in the PJSIP stack, providing subscriptions to lists of resources and batched delivery of NOTIFY requests.
  Inter-Asterisk distributed device state and mailbox state using the PJSIP stack.
  And much more!
  It is important to note that Asterisk 13 is built on the architecture developed during the previous Standard release, Asterisk 12. Users upgrading to Asterisk 13 should read about the new features documented in New in 12, as well as the notes on upgrading to Asterisk 12. In particular, users upgrading to Asterisk 13 from a release prior to Asterisk 12 should read the specifications on AMI, CDRs, and CEL, as these also apply to Asterisk 13:
  AMI v2 Specification
  Asterisk 12 CEL Specification
  Asterisk 12 CDR Specification
  Finally, all users upgrading to Asterisk 13 should read the notes on upgrading to Asterisk 13.
  Asterisk 12 was different
  Icon
  Some of the new features listed below were released in point releases of Asterisk 12. Per the Software Configuration Management Policies laid out for Asterisk 12, new features were periodically merged and released in that branch of Asterisk. This was done to help users of Asterisk migrating to the new platform develop features in preparation for Asterisk 13.
  While some of the features listed below were released under an Asterisk 12 release, they are all listed here as "new in 13", for two reasons:
  If you are upgrading from a previous LTS release (such as Asterisk 11), all of these features are new.
  If you are upgrading from some version of Asterisk 12, some of the previously released features may be new (as they may not have been in your version of Asterisk 12).
  Applications
  AgentRequest
  The application will now return a new AGENT_STATUS value of NOT_CONNECTED if the agent fails to connect with an incoming caller after being alerted to the presence of the incoming caller. The most likely reason this would happen is the agent did not acknowledge the call in time.
  ChanSpy
  ChanSpy now accepts a channel uniqueid or a fully specified channel name as the chanprefix parameter if the 'u' option is specified.
  ConfBridge
  The ConfBridge dialplan application now sets a channel variable, CONFBRIGE_RESULT, upon exiting. This variable can be used to determine how a channel exited the conference. Valid values upon exiting are:
  Value
  Reason
  FAILED
  The channel encountered an error and could not enter the conference.
  HANGUP
  The channel exited the conference by hanging up.
  KICKED
  The channel was kicked from the conference.
  ENDMARKED
  The channel left the conference as a result of the last marked user leaving.
  DTMF
  The channel pressed a DTMF sequence to exit the conference.
  Added conference user option 'announce_join_leave_review'. This option implies 'announce_join_leave' with the added effect that the user will be asked if they want to confirm or re-record the recording of their name when entering the conference.
  DAHDIBarge
  The module app_dahdibarge was deprecated and has been removed. Users of DAHDIBarge should use ChanSpy instead.
  Directory
  At exit, the Directory application now sets a channel variable DIRECTORY_RESULT to one of the following based on the reason for exiting:
  Value
  Reason
  OPERATOR
  user requested operator by pressing '0' for operator
  ASSISTANT
  user requested assistant by pressing '*' for assistant
  TIMEOUT
  user pressed nothing and Directory stopped waiting
  HANGUP
  user's channel hung up
  SELECTED
  user selected a user from the directory and is routed
  USEREXIT
  user pressed '#' from the selection prompt to exit
  FAILED
  directory failed in a way that wasn't accounted for. Dang.
  On this Page
  Overview
  Applications
  AgentRequest
  ChanSpy
  ConfBridge
  DAHDIBarge
  Directory
  MusicOnHold
  MixMonitor
  Monitor
  Page
  PickupChan
  ReadFile
  Record
  Say
  SayCountPL
  SetMusicOnHold
  VoiceMail
  WaitMusicOnHold
  Build System
  Core
  Account Codes
  AMI
  Actions
  Events
  ARI
  CEL
  CLI
  Features
  HTTP
  RealTime
  TLS
  CDR Backends
  cdr_sqlite
  cdr_pgsql
  CEL Backends
  cel_pgsql
  Channel Drivers
  chan_dahdi
  chan_gtalk
  chan_h323
  chan_jingle
  chan_sip
  Functions
  AST_SORCERY
  AUDIOHOOK_INHERIT
  CONFBRIDGE
  JACK_HOOK
  MIXMONITOR
  PERIODIC_HOOK
  TALK_DETECT
  Resources
  res_config_pgsql
  res_hep
  res_hep_pjsip
  res_hep_rtcp
  res_mwi_external
  res_parking
  res_pjsip
  res_pjsip_multihomed
  res_pjsip_outbound_publish
  res_pjsip_outbound_registration
  res_pjsip_pidf_digium_body_supplement
  res_pjsip_pubsub
  res_pjsip_publish_asterisk
  res_pjsip_send_to_voicemail
  MusicOnHold
  MusicOnHold streams (all modes other than "files") now support wide band audio.
  MixMonitor
  A new option, B(), has been added that will turn on a periodic beep while the call is being recorded.
  New options to play a beep when starting a recording and stopping a recording have been added. The option 'p' will play a beep to the channel that starts the recording. The option 'P' will play a beep to the channel that stops the recording.
  Monitor
  A new option, B(), has been added that will turn on a periodic beep while the call is being recorded.
  Page
  Added options 'b' and 'B' to apply pre-dial handlers for outgoing calls and for the channel executing Page respectively.
  PickupChan
  PickupChan now accepts channel uniqueids of channels to pickup.
  ReadFile
  The module app_readfile was deprecated and has been removed. Users of ReadFile should use func_env's FILE function instead.
  Record
  The Record application now has an option 'o' which allows 0 to act as an exit key. This will set the the RECORD_STATUS variable to 'OPERATOR' instead of 'DTMF'.
  Say
  If the channel variable SAY_DTMF_INTERRUPT is present on a channel and set to 'true' (case insensitive), then any Say application (SayNumber, SayDigits, SayAlpha, SayAlphaCase, SayUnixTime, and SayCounted) will anticipate DTMF. If DTMF is received, these applications will behave like the background application and jump to the received extension once a match is established or after a short period of inactivity.
  The Say family of dialplan applications now support the Japanese language. The language parameter in say.conf now recognizes a setting of ja, which will enable Japanese language specific mechanisms for playing back numbers, dates, and other items.
  SayCountPL
  The module app_saycountpl was deprecated and has been removed. Users of app_saycountpl should use the Say family of applications.
  SetMusicOnHold
  The SetMusicOnHold dialplan application was deprecated and has been removed. Users of the application should use the CHANNEL function's musicclass setting instead.
  VoiceMail
  VoiceMail and VoiceMailMain now support the Japanese language. The language parameter in voicemail.conf now recognizes a setting of ja, which will enable prompts to be played back using a Japanese grammatical structure. Additional prompts are necessary for this functionality, including:
  jb-arimasu: there is
  jb-arimasen: there is not
  jb-oshitekudasai: please press
  jb-ni: article ni
  jb-ga: article ga
  jb-wa: article wa
  jb-wo: article wo
  VoiceMail mailboxes configured in voicemail.conf can now have multiple e-mail address specified for a single mailbox. Each e-mail address is separated by the | character.
  WaitMusicOnHold
  The WaitMusicOnHold dialplan application was deprecated and has been removed. Users of the application should use MusicOnHold with a duration parameter instead.
  Build System
  The location of the sample configuration files delivered with Asterisk have been moved from configs to configs/samples. This allows for other sample configuration sets to be defined in the future. The action of make samples is exactly the same as previous versions of Asterisk.
  The menuselect tool has been pulled into the Asterisk repository. Generally, this change is transparent to those using tarballs of Asterisk; to those working directly with the Asterisk repository, there is no accessing of the menuselect or mxml external repositories.
  The menuselect tool no longer uses a bundled mxml library. Instead, it now uses libxml2. As a result, the libxml2 development library is now a required dependency for Asterisk.
  Core
  Account Codes
  Support for peeraccount was vastly improved in this version of Asterisk. Except for Queue, an accountcode is now consistently propagated to outgoing channels before dialing. A channel's accountcode can change from its original non-empty value on channel creation for the following specific reasons:
  The dialplan sets it using CHANNEL(accountcode).
  An originate method specifies an accountcode value.
  The calling channel propagates its peeraccount or accountcode to the outgoing channel's accountcode before dialing.
  This change has two visible effects. One, Local channels now cross accountcode and peeraccount codes across the special bridge between the ;1 and ;2 channels just like channels between normal bridges. Two, the CHANNEL(peeraccount) value can now be set before Dial and FollowMe to set the accountcode on the outgoing channel(s).
  For Queue, an outgoing channel's non-empty accountcode will not change unless explicitly set by CHANNEL(accountcode). The change has three visible effects:
  As previously mentioned, Local channels now cross accountcode and peeraccount across the special bridge between the ;1 and ;2 channels just like channels between normal bridges.
  The queue member will get an accountcode if it doesn't have one and one is available from the calling channel's peeraccount.
  accountcode propagation includes Local channel members where the accountcodes are propagated early enough to be available on the ;2 channel.
  AMI
  Added a new module that provides AMI control over MWI within Asterisk, res_mwi_external_ami. Note that this module depends on res_mwi_external; for more information on enabling this module, see res_mwi_external. This module provides the MWIGet/MWIUpdate/MWIDelete actions, as well as the MWIGet/MWIGetComplete events.
  Actions
  Added DialplanExtensionAdd and DialplanExtensionRemove AMI actions. These actions are analogous to the dialplan add extension and dialplan remove extension CLI commands, respectively.
  Added AMI action LoggerRotate, which reloads and rotates logger in the same manner as the CLI command logger rotate.
  Added AMI actions FAXSessions, FAXSession, and FAXStats, which replicate the functionality of the CLI commands fax show sessions, fax show session, and fax show stats respectively.
  Added AMI actions PRIDebugSet, PRIDebugFileSet, and PRIDebugFileUnset, which enable manager control over PRI debugging levels and file output.
  The AMI action PJSIPNotify may now send to a URI instead of only to a PJSIP endpoint as long as a default outbound endpoint is set. This also applies to the equivalent CLI command (pjsip send notify).
  The AMI action PJSIPShowEndpoint now includes ContactStatusDetail sections that give information on Asterisk's attempts to qualify the endpoint.
  The MixMonitor action now has a Command header that can be used to indicate a post-process command to run once recording finishes.
  Added AMI actions DeviceStateList, PresenceStateList, and ExtensionStateList. Each of these can be used to list the current device states, presence states, and extension states respectively. The DeviceStateList and PresenceStateList actions are provided by the res_manager_device_state.so and res_manager_presence_state.so modules, respectively.
  Originate now takes optional parameters: ChannelId and OtherChannelId, which can be used to set the channel uniqueid on creation. The other id (specified by OtherChannelId) is only used when originating a Local channel, and is assigned to the second channel half of a Local channel. If a Local channel is originated and OtherChannelId is not specified, Asterisk will default to appending a ;2 to the identifier provided by ChannelId.
  Events
  New DeviceStateChanged and PresenceStateChanged AMI events have been added. These events are emitted whenever a device state or presence state change occurs. The events are controlled by res_manager_device_state.so and res_manager_presence_state.so. If the high frequency of these events is problematic for you, do not load these modules.
  New events have been added for the TALK_DETECT function. When the function is used on a channel, ChannelTalkingStart/ChannelTalkingStop events will be emitted to connected AMI clients indicating the start/stop of talking on the channel.
  The DialStatus field in the DialEnd event can now contain additional statuses that convey how the dial operation terminated. This includes ABORT, CONTINUE, and GOTO.
  AMI will now emit security events. A new class authorization has been added in manager.conf for the security events, security. The new events are:
  Event
  Description
  FailedACL Raised when a request violates an ACL check.
  InvalidAccountID Raised when a request fails an authentication check due to an invalid account ID.
  SessionLimit Raised when a request fails due to exceeding the number of allowed concurrent sessions for a service.
  MemoryLimit
  Raised when a request fails due to an internal memory allocation failure.
  Icon
  This event is a bit optimistic. While you may receive this event when Asterisk runs out of memory, it is highly likely that Asterisk is... out of memory. Making events is sometimes out of the question at that point.
  LoadAverageLimit Raised when a request fails because a configured load average limit has been reached.
  RequestNotAllowed Raised when a request is not allowed by the service..
  AuthMethodNotAllowed Raised when a request used an authentication method not allowed by the service.
  RequestBadFormat Raised when a request is received with bad formatting.
  SuccessfulAuth Raised when a request successfully authenticates.
  UnexpectedAddress Raised when a request has a different source address then what is expected for a session already in progress with a service.
  ChallengeResponseFailed Raised when a request's attempt to authenticate has been challenged, and the request failed the authentication challenge.
  InvalidPassword Raised when a request provides an invalid password during an authentication attempt.
  ChallengeSent Raised when an Asterisk service send an authentication challenge to a request.
  InvalidTransport Raised when a request attempts to use a transport not allowed by the Asterisk service.
  Bridge related events now have two additional fields: BridgeName and BridgeCreator. BridgeName is a descriptive name for the bridge; BridgeCreator is the name of the entity that created the bridge. This affects the following events: ConfbridgeStart, ConfbridgeEnd, ConfbridgeJoin, ConfbridgeLeave, ConfbridgeRecord, ConfbridgeStopRecord, ConfbridgeMute, ConfbridgeUnmute, ConfbridgeTalking, BlindTransfer, AttendedTransfer, BridgeCreate, BridgeDestroy, BridgeEnter, and BridgeLeave.
  ARI
  Operations that create a resource can now provide the unique identifier as a parameter to the creation request. This includes:
  Channels:
  A channelId can now be provided when creating a channel, either in the request URI (POST channels/my-channel-id) or as a query parameter. A Local channel will suffix the second channel id with ;2 unless the otherChannelId is provided as a query parameter.
  A snoop channel can be started with a snoopId, in the request URI (POST channels/my-channel-id/snoop/my-snoop-id) or as a query parameter.
  Bridges: A bridgeId can now be provided when creating a bridge, either in the request URI (POST bridges/my-bridge-id) or as a query parameter.
  Playbacks: A playbackId can be provided when starting a playback, either in the request URI (POST channels/my-channel-id/play/my-playback-id or POST bridges/my-bridge-id/play/my-playback-id) or as a query parameter.
  Bridges: the bridge type used when creating a bridge is now a comma separated list of bridge properties. Valid options are: mixing, holding, dtmf_events, and proxy_media.
  The LiveRecording object in recording events now contains a target_uri field which contains the URI of what is being recorded.
  Stored recordings now support a new operation, copy. This will take an existing stored recording and copy it to a new location in the recordings directory.
  LiveRecording objects now have three additional fields that can be reported in a RecordingFinished ARI event:
  total_duration: the duration of the recording.
  talking_duration: optional. The duration of talking detected in the recording. This is only available if max_silence_seconds was specified when the recording was started.
  silence_duration: optional. The duration of silence detected in the recording. This is only available if max_silence_seconds was specified when the recording was started.
  Note that all duration values are reported in seconds.
  Users of ARI can now send and receive out of call text messages. Messages can be sent using a sendMessage operation either directly to a particular endpoint or to the endpoints resource directly. In the latter case, the destination is derived from the URI scheme. Text messages are passed to ARI clients as TextMessageReceived events. ARI clients can choose to receive text messages by subscribing to the particular endpoint technology or endpoints that they are interested in.
  The applications resource now supports subscriptions to all endpoints of a particular channel technology. For example, subscribing to an eventSource of endpoint:PJSIP will subscribe to all PJSIP endpoints.
  New event models have been added for the TALK_DETECT function. When the function is used on a channel, ChannelTalkingStarted/ChannelTalkingFinished events will be emitted to connected WebSockets subscribed to the channel, indicating the start/stop of talking on the channel.
  A new Playback URI tone has been added. Tones are specified either as an indication name, e.g., tone:busy , from indications.conf or as a tone pattern, e.g., tone:240/250,0/250. Tones differ from normal playback URIs in that they must be stopped manually and will continue to occupy a channel's ARI control queue until they are stopped. They also can not be rewound or fast-forwarded.
  User events can now be generated from ARI. Events can be signalled with arbitrary JSON variables, and include one or more of channel, bridge, or endpoint snapshots. An application must be specified which will receive the event message (other applications can subscribe to it). If a channel is specified, the message will also be delivered to connected AMI clients. Dialplan generated user event messages are still transmitted via the channel, and will only be received by a Stasis application they are attached to or if something is subscribed to the channel.
  The Bridge data model now contains the additional fields name and creator. The name field conveys a descriptive name for the bridge; the creator field conveys the name of the entity that created the bridge. This affects all responses to HTTP requests that return a Bridge data model as well as all event derived data models that contain a Bridge data model. The POST /bridges operation may now optionally specify a name to give to the bridge being created.
  Added a new ARI resource mailboxes which allows the creation and modification of mailboxes managed by external MWI. Modules res_mwi_external and res_stasis_mailbox must be enabled to use this resource. For more information on external MWI control, see res_mwi_external.
  Added new events for externally initiated transfers. The event BridgeBlindTransfer is now raised when a channel initiates a blind transfer of a bridge in the ARI controlled application to the dialplan; the BridgeAttendedTransfer event is raised when a channel initiates an attended transfer of a bridge in the ARI controlled application to the dialplan.
  Channel variables may now be specified as a body parameter to the POST /channels operation. The variables key in the JSON is interpreted as a sequence of key/value pairs that will be added to the created channel as channel variables. Other parameters in the JSON body are treated as query parameters of the same name.
  CEL
  The bridge_technology extra field key has been added to BRIDGE_ENTER and BRIDGE_EXIT events.
  CLI
  core show locks output now includes Thread/LWP ID, if the platform supports this feature.
  New logger add channel and logger remove channel CLI commands have been added to allow creation and deletion of dynamic logger channels without configuration changes. These dynamic logger channels will only exist until the next restart of asterisk.
  Features
  Channel variables are now substituted in arguments passed to applications run by using dynamic features.
  HTTP
  Asterisk's HTTP server now supports chunked Transfer-Encoding. This will be automatically handled by the HTTP server if a request is received with a Transfer-Encoding type of chunked.
  RealTime
  A new set of Alembic scripts has been added for CDR tables. This will create a cdr table with the default schema that Asterisk expects.
  Numerous updates have been made to the database schemas for several tables. See the Upgrading to Asterisk 13 notes for more information.
  TLS
  The TLS core in Asterisk now supports Perfect Forward Secrecy (PFS). Enabling PFS is attempted by default, and is dependent on the configuration of the module using TLS.
  Ephemeral ECDH (ECDHE) is enabled by default. To disable it, do not specify a ECDHE cipher suite in sip.conf, for example:
  Ephemeral DH (DHE) is disabled by default. To enable it, add DH parameters into the private key file, e.g., sip.conf tlsprivatekey. For example, the default dh2048.pem - see http://www.opensource.apple.com/source/OpenSSL098/OpenSSL098-35.1/src/apps/dh2048.pem?txt
  Because clients expect the server to prefer PFS, and because OpenSSL sorts its cipher suites by bit strength, see openssl ciphers -v DEFAULT. Consider re-ordering your cipher suites in the respective configuration file. For example:
  will use PFS when offered by the client. Clients which do not offer PFS fall-back to AES-128 (or even 3DES, as recommended by RFC 3261).
  CDR Backends
  cdr_sqlite
  This module was deprecated and has been removed. Users of cdr_sqlite should use cdr_sqlite3_custom.
  cdr_pgsql
  Added the ability to support PostgreSQL application_name on connections. This allows PostgreSQL to display the configured name in the pg_stat_activity view and CSV log entries. This setting is configurable for cdr_pgsql via the appname configuration setting in cdr_pgsql.conf.
  CEL Backends
  cel_pgsql
  Added the ability to support PostgreSQL application_name on connections. This allows PostgreSQL to display the configured name in the pg_stat_activity view and CSV log entries. This setting is configurable for cel_pgsql via the appname configuration setting in cel_pgsql.conf.
  Channel Drivers
  chan_dahdi
  SS7 support now requires libss7 v2.0 or later.
  Added SS7 support for connected line and redirecting.
  Most SS7 CLI commands have been reworked as well; additionally, new SS7 commands added. See the online CLI help for more information.
  Several SS7 config option parameters have been added; see the description in chan_dahdi.conf.sample.
  chan_gtalk
  This module was deprecated and has been removed. Users of chan_gtalk should use chan_motif.
  chan_h323
  This module was deprecated and has been removed. Users of chan_h323 should use chan_ooh323.
  chan_jingle
  This module was deprecated and has been removed. Users of chan_jingle should use chan_motif.
  chan_sip
  The SIPPEER dialplan function no longer supports using a colon as a delimiter for parameters. The parameters for the function should be delimited using a comma.
  The SIPCHANINFO dialplan function was deprecated and has been removed. Users of the function should use the CHANNEL function instead.
  SIP peers can now specify trust_id_outbound which affects RPID/PAI fields for prohibited callingpres information. Values are legacy, no, and yes. By default, legacy is used.
  trust_id_outbound=legacy - behaviour remains the same as in previous versions of Asterisk. When dealing with prohibited callingpres and sendrpid=pai/rpid, RPID/PAI headers are appended to outbound SIP messages just as they are with allowed callingpres values, but data about the remote party's identity is anonymized. When sendrpid=rpid, only the remote party's domain is anonymized.
  trust_id_outbound=no - when dealing with prohibited callingpres, RPID/PAI headers are not sent.
  trust_id_outbound=yes - RPID/PAI headers are applied with the full remote party information intact even for prohibited callingpres information. In the case of PAI, a Privacy: id header will be appended for prohibited calling information to communicate that the private information should not be relayed to untrusted parties.
  TEL URI support for inbound INVITE requests has been added. chan_sip will now handle TEL schemes in the Request and From URIs. The phone-context in the Request URI will be stored in the SIPURIPHONECONTEXT channel variable on the inbound channel.
  Functions
  AST_SORCERY
  The AST_SORCERY function exposes sorcery-based configuration files like pjsip.conf to the dialplan.
  AUDIOHOOK_INHERIT
  The AUDIOHOOK_INHERIT function has been deprecated. Audiohooks are now unconditionally inherited through masquerades. As a side benefit, more than one audiohook of a given type may persist through a masquerade now.
  CONFBRIDGE
  The CONFBRIDGE dialplan function is now capable of creating/modifying dynamic conference user menus.
  The CONFBRIDGE dialplan function is now capable of removing dynamic conference menus, bridge settings, and user settings that have been applied by the CONFBRIDGE dialplan function.
  JACK_HOOK
  The JACK_HOOK function now supports audio with a sample rate higher than 8kHz.
  MIXMONITOR
  A new function, MIXMONITOR, has been added to allow access to individual instances of MixMonitor on a channel.
  PERIODIC_HOOK
  A new function, PERIODIC_HOOK, has been added which allows for running a periodic dialplan hook on a channel. Any audio generated by this hook will be injected into the call.
  TALK_DETECT
  A new function, TALK_DETECT, has been added. When set on a channel, this function causes events indicating the starting/stopping of talking on said channel to be emitted to both AMI and ARI clients.
  Resources
  res_config_pgsql
  Added the ability to support PostgreSQL application_name on connections. This allows PostgreSQL to display the configured name in the pg_stat_activity view and CSV log entries. This setting is configurable for res_config_pgsql via the dbappname configuration setting in res_pgsql.conf.
  res_hep
  A new module, res_hep, has been added that acts as a generic packet capture agent for the Homer Encapsulation Protocol (HEP) version 3. It can be configured via hep.conf. Other modules use res_hep to send message traffic to a HEP capture server.
  res_hep_pjsip
  A new module, res_hep_pjsip, has been added that will forward PJSIP message traffic to a HEP capture server. See res_hep for more information.
  res_hep_rtcp
  A new module, res_hep_rtcp, has been added that will forward RTCP call statistics to a HEP capture server. See res_hep for more information.
  res_mwi_external
  A new module, res_mwi_external, has been added to Asterisk. This module acts as a base framework that other modules can build on top of to allow an external system to control MWI within Asterisk. For implementations that make use of res_mwi_external, see the res_mwi_external_ami notes under the AMI changes and res_ari_mailboxes notes under the ARI changes. Note that res_mwi_external conflicts with other modules that may produce MWI themselves, such as app_voicemail. res_mwi_external and other modules that depend on it cannot be built or loaded with app_voicemail present.
  res_parking
  Manager action Park now takes an additional argument AnnounceChannel which can be used to announce the parked call's location to an arbitrary channel in a bridge. If Channel and TimeoutChannel are the two parties in a two-party bridge, TimeoutChannel is treated as having parked Channel (in the same manner as the Park Call DTMF feature) and will receive announcements prior to being hung up.
  res_pjsip
  The endpoint configuration object now supports accountcode. Any channel created for an endpoint with this setting will have its accountcode set to the specified value.
  transport and endpoint ToS options (tos, tos_audio, and tos_video) may now be set as the named set of ToS values ( cs0 - cs7, af11 - af43, ef).
  Added the following new CLI commands:
  pjsip show contacts - list all current PJSIP contacts.
  pjsip show contact - show specific information about a current PJSIP contact.
  pjsip show channel - show detailed information about a PJSIP channel.
  Path support has been added with the support_path option in registration and aor sections. This functionality is provided by a new module, res_pjsip_path.so.
  A debug option has been added to the globals section that will allow sip messages to be logged.
  A set_var option has been added to endpoints that will automatically set the desired variable(s) on a channel created for that endpoint.
  DNS functionality will now automatically be enabled if the system configured nameservers can be retrieved. If the system configured nameservers can not be retrieved the functionality will resort to using basic system resolution. Functionality such as SRV records and fail-over will not be available if the basic system resolution is in use.
  Several new tables and columns have been added to the realtime schema for the res_pjsip related modules. See the UPGRADE notes for updating the database schema.
  res_pjsip_multihomed
  A new module, res_pjsip_multihomed handles situations where the system Asterisk is running out has multiple interfaces. res_pjsip_multihomed determines which interface should be used during message sending.
  res_pjsip_outbound_publish
  A new module, res_pjsip_outbound_publish provides the mechanisms for sending PUBLISH requests for specific event packages to another SIP User Agent. See Exchanging Device and Mailbox State Using PJSIP for examples on configuring this feature.
  res_pjsip_outbound_registration
  A new CLI command has been added: pjsip show registrations, which lists all configured PJSIP registrations.
  res_pjsip_pidf_digium_body_supplement
  A new module, res_pjsip_pidf_digium_body_supplement provides NOTIFY request body formatting for presence support in Digium phones.
  res_pjsip_pubsub
  Subscriptions can now be persisted via the subscription_persistence object in pjsip.conf. Note that it is up to the configuration in sorcery.conf to determine how the subscription is persisted.
  The publish/subscribe core module has been updated to support RFC 4662 Resource Lists, allowing Asterisk to act as a Resource List Server (RLS). Resource lists are configured in pjsip.conf under a new object type, resource_list. Resource lists can contain either message-summary or presence events, can be composed of specific resources that provide the event, or other resource lists.
  Inbound publication support is provided by a new object, inbound-publication. This configures res_pjsip_pubsub to accept PUBLISH requests from a particular resource. Which events are accepted is constructed dynamically; see res_pjsip_publish_asterisk for more information and Exchanging Device and Mailbox State Using PJSIP for examples on configuring this feature.
  res_pjsip_publish_asterisk
  A new module, res_pjsip_publish_asterisk adds support for PUBLISH requests of Asterisk information to other Asterisk servers. This module is intended only for Asterisk to Asterisk exchanges of information. Currently, this includes both mailbox state and device state information. See Exchanging Device and Mailbox State Using PJSIP for examples on configuring this feature.
  res_pjsip_send_to_voicemail
  A new module, res_pjsip_send_to_voicemail allows for REFER requests with particular headers to transfer a PJSIP channel directly to a particular extension that has VoiceMail. This is intended to be used with Digium phones that support this feature.
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