This documentation has been extracted from the source of Yate-0.9-CVS and as such it might not be accurate -- technically or semantically.
The call.ringing message seems to be emitted by a channel-creating module (such as h323chan and ysipchan).
The message seems to have been designed for asynchronous processing (broadcast).
- yes or no -- currently, the code sets this to yes unconditionally
- the remote IP address of the RTP channel.
- the remote port of the RTP channel
- a comma-separated list of supported formats (codecs) advertised by the remote end of the RTP channel.