[asterisk-users] music ring (CRBT)

[Peng Yong]

i search the mailing list and don't know how to do CRBT
(Coloring Ring Back Tone). when the caller call a sip 
user of asterisk, he will hear music ring before the call
is answered.

caller <---> PSTN <---> PRI <---> Sangoma 104D <---> asterisk <--> sip
user


and i found Dial command has a option:

m: Provide Music on Hold to the calling party until the
called channel answers. This is mutually exclusive with option 'r',
obviously. Use m(class) to specify a class for the music on hold. 


exten => 81206802,1,Dial(SIP/6802|120|m)

and asterisk console shows:

-- Started music on hold, class 'default', on Zap/77-1

but caller hears nothing, no ring and no music.
if i remove 'm' option, the caller can hear ring.

is PRI support music ring?


-- 
Peng Yong