[asterisk-users] Cannot hear ringback music from telco

[Vincent Tam]

Hello,

We have an asterisk 1.2.13 box that use a Digium TE205P T1 PRI connect to
the telco, users mainly use snom 320/300 SIP phones.
When dialing to an external phone number with custom ringback music, users
reported that they could not hear the music but can only hear the standard
ring tone generated by the system.

Is there any kind of settings need to allow the ringback music pass to the
phone? We only use this simple dialplan to make outgoing call:

exten => _9.,1,Set(CALLERID(all)=${CIDPREFIX}${CALLERIDNUM})
exten => _9.,n,Dial(Zap/g0/${EXTEN:1}||T)

 * CIDPREFIX is the 5 digit prefix of the company's PRI line, CALLERIDNUM
are 3 digit internal numbers

Thanks!
Vincent
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