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simon at icedrop.net
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 Posted: Tue Jun 03, 2008 4:50 am Post subject: [asterisk-users] G.722 over ISDN PRI/BRI |
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Hi,
G.722 is heavily used by Broadcasters worldwide for wideband voice
communications over ISDN. I'd like to be able to receive these G.722 over ISDN
calls into an Asterisk exchange (with mostly a view to routing the calls to a
Voicemail box where material can be recorded). I have been examining source
code for the 3 different ISDN Channels in Asterisk and they all seem to be hard-
codec to aLaw/uLaw G.711. It looks as though chan_capi *might* support bridging
of G.722 data from one ISDN port to another, but not routing to any other
source/transcoding/passing to voicemail.
So I guess my question is, am I correct in the belief that all Asterisk's ISDN
channels currently don't support anything other than G.711? How easy would it
be to extend one of the ISDN channels to support G.722?
Cheers,
Simon |
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creslin at digium.com
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| Posted: Wed Jun 04, 2008 10:06 am Post subject: [asterisk-users] G.722 over ISDN PRI/BRI |
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Simon Hyde wrote:
| Quote: | Hi,
G.722 is heavily used by Broadcasters worldwide for wideband voice
communications over ISDN. I'd like to be able to receive these G.722 over ISDN
calls into an Asterisk exchange (with mostly a view to routing the calls to a
Voicemail box where material can be recorded). I have been examining source
code for the 3 different ISDN Channels in Asterisk and they all seem to be hard-
codec to aLaw/uLaw G.711. It looks as though chan_capi *might* support bridging
of G.722 data from one ISDN port to another, but not routing to any other
source/transcoding/passing to voicemail.
So I guess my question is, am I correct in the belief that all Asterisk's ISDN
channels currently don't support anything other than G.711? How easy would it
be to extend one of the ISDN channels to support G.722?
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Your belief is correct. Right now, the ISDN channels (at least in
chan_zap) G.711 is the only voice codec that is supported. I'm not sure
what is going to be necessary to get G.722 working there. If it's as
simple as changing the bearer capability, the chan_zap work on top of
that should be fairly easy.
If you have to implement any of the H.* specs to get it working, that
will be a bit more trouble.
--
Matthew Fredrickson
Software/Firmware Engineer
Digium, Inc. |
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