webrtc, rtp: extend min/maxPort doc in BaseRtpEndpoint.conf.ini
;; Port range for incoming RTP streams.
;;
;; These two parameters define the minimum and maximum ports that Kurento Media
-;; Server will open (bind to) in order to receive RTP packets from remote peers.
+;; Server will bind to (listen) in order to receive remote RTP packets.
;; This affects the operation of both RtpEndpoint and WebRtcEndpoint.
;;
+;; Plain RTP (RtpEndpoint) needs 2 ports for each media kind: an even port is
+;; used for RTP, and the next odd port is used for RTCP.
+;;
+;; WebRTC (WebRtcEndpoint) uses RTCP Multiplexing (rtcp-mux) when possible, so
+;; it only uses 1 port for each media kind.
+;;
;; * Unit: port number.
+;; * Range: [1024..65535].
+;; - minPort should be an even number (will be used for RTP).
+;; - maxPort should be an odd number (will be used for RTCP).
;; * Default: [1024..65535]. This is the whole range of non-privileged ports.
;minPort=1024
;maxPort=65535
