Chris Shaw wrote:
- Channel Support:
IAX2 in asterisk
IAX2 in libiax2
Other IP channels in asterisk (RTP-based ones, I guess are all that is
left).
CNG/VAD and DTX in SIP is a must if * is to be taken seriously as a complete
solution... As much as we all hate it's complexity and wish that everything
would speak IAX (I know I do) a large number of devices support (and will be
supporting) SIP, making it equally as important as IAX2 in using * as a
complete telephony solution...
This is nothing to do with SIP. It is an RTP issue, common to everything
which uses RTP - SIP and H.323 included. Sending no packets is perfectly
valid, and normal, in RTP. If the receiving end takes no packets (other
than, perhaps, an extremely long silence) as a disconnect it does not
comply with the RTP spec. DTX is much despised, and CNG only slightly
better. They just sound good (pun intende) on paper.
DTX Support: Sending a single CN packet (in IAX2, this should probably
sent reliably) would probably be good.
I second, third and fourth this one as does anyone who's tried to use
BroadVoice with Voicemail... Currently when * is not making any noise (e.g.
recording) absolutely NO packets are sent back to the proxy... A lot of
proxies take this as a sign that the far end has disconnected... Including
BroadWorks! But they do recognize small CN packets as a sign that the SIP
device (Asterisk) is still there...
A lot of CNG spec. call for only one transmission, and then silence.
Continued CNG has real benefits, but it certainly not the norm.
PLC I think is somewhat implemented already in codecs that support it, but I
could be wrong, I remember seeing mention of it in the code...
PLC is seldom included in the codecs. If you read the specs they often
mention PLC, but only in terms of how the codec mitigates the awfulness
of a lost packet. Few codecs actually include it.
Regards,
Steve
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