Hi Karl,
that's funny you are asking this, am also currently looking at how to
solve the g722 codec negotiation riddle, in my particular case to play
nicely together with a KonfTel 300 IP conference phone.
> In other words, incoming calls are easy since codecs are negotiated
> from least-known (the remote party) to most-known (my endpoint) and my
> codecs can simply be preferred accordingly to match the remote.
Look at setting the channel variable_SIP_CODEC - however it might or
might not work depending on your version of Asterisk, see for example:
https://issues.asterisk.org/view.php?id=13243
Here's a dialplan snippet that might give you another hint or two.
exten => 123,1,NoOp(-- Inbound read: ${CHANNEL(audioreadformat)} --)
exten => 123,n,NoOp(-- Inbound native: ${CHANNEL(audionativeformat)} --)
exten => 123,n,Set(WIDEBAND=0)
exten => 123,n,Set(WIDEBAND=${REGEX("g722"
${SIPPEER(${SIPCHANINFO(peername)}:codecs)})})
exten => 123,n,ExecIf($[${WIDEBAND} = 1]|Set|_SIP_CODEC=g722)
exten => 123,n,Dial(SIP/abc123)
Please note the SPACE between ${REGEX("g722" and ${SIPPEER
> Outbound calls seem harder. Our endpoints always negotiate g.722 between
> themselves and Asterisk and then Asterisk must transcode to the preferred
> codec of the REMOTE party. Not ideal.
Together with the g722 transcoding patch for Asterisk 1.4.17 it does not
work out, unfortunately. Currently I cannot make a statement on a more
recent 1.4 release.
g722 patch: http://users.netplex.net/~andrew/asterisk/#g722
Older patch that I use for 1.4.17:
http://users.netplex.net/~andrew/asterisk/g722-20080110.patch.gz
However I can successfully employ setting _SIP_CODEC if in the example
above instead of "Dial()" I do a "MusicOnHold()" - both with or without a
preceeding ANSWER; without means early audio playing of the native g722
encoded MOH file. My snom starts out with alaw, and then we switch to
g722.
> Is there an elegant way to do this?
Consider the codec negotiation patch? I'd be interested to hear about
your results!
http://www.b2bua.org/wiki/AsteriskCodecNegotiationPatch
https://issues.asterisk.org/view.php?id=4825
Philipp
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