[asterisk-users] Cannot hear ringback music from telco

[Trevor Peirce]

Vincent Tam wrote:
> 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)
>  
Try adding an Answer between those two, just to see who is producing the 
ringing.  If you do NOT hear ringing but DO hear music, it's an asterisk 
or snom problem.  If you still hear ringing, it's your PRI.

Might also want to check in to the phone's manual to see if there's a 
setting to enable early-audio.

Trevor