We have an external FXO/FXS, and use Asterisk as a call router. We want to use
G723 for the actual phone calls, because we have limited bandwidth on our return
direction. This has been working fine so far.
However, now we want to set up Asterisk to handle PBX menues and accept
extentions. Asterisk, of course, uses GSM for its messages, and cannot
terminate G723 calls. So I want to tell Asterisk, FXO, and FXS to use GSM for
messages and G723 for the data connection. The FXO/FXS would support this, but
Asterisk isn't working as I wish. Though I can provide it with a list of
coding schemes:
; set up codecs
disallow=all
allow=gsm
allow=g723.1
allow=g729
It never uses anything but the first one. So if I use the above scheme,
messages are played successfully, but the calls go through using GSM. If I put
G723.1 first, Asterisk aborts with an error message (cannot convert gsm to
g723.1).
Is there some way I can solve this problem, such as explicitly telling * to use
GSM for its messages, and G723 for the handed-off data connection??
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