code: AsteriskChannelImpl getChannelImplByNameAndActive(String name)
      {
  
          // In non bristuffed AST 1.2, we don't have uniqueid header to match the
          // channel
          // So we must use the channel name
          // Channel name is unique at any give moment in the * server
          // But asterisk-java keeps Hungup channels for a while.
          // We don't want to retrieve hungup channels.
  
          AsteriskChannelImpl channel = null;
  
          if (name == null)
          {
              return null;
          }
  
          synchronized (channels)
          {
              for (AsteriskChannelImpl tmp : channels.values())
              {
                  if (name.equals(tmp.getName()) && tmp.getState() != ChannelState.HUNGUP)
                  {
                      channel = tmp;
                  }
              }
          }
          return channel;
      }
docs: Returns a NON-HUNGUP channel from the ChannelManager's cache with the
  given name.
  
  @param name the name of the requested channel.
  @return the NON-HUNGUP channel if found, or null if none is found.