[asterisk-users] Providing Ringback

Igor Hernandez emistz at gmail.com
Fri Nov 7 23:07:23 CST 2008

Thanks a lot Grey. I'll look into it.


Igor Hernandez
Escape Communications

Grey Man wrote:
> Hi Igor,
> We had an interconnect with a carrier that generated early media for
> progress indications but the carrier's switch, in this case a Cerpack,
> would only start sending the RTP for the early media AFTER it received
> an RTP packet from the Asterisk end. Completely stupid behaviour since
> early media is generally only one way but that's what it did.
> We worked around it by recording 200ms of silence and playing that
> back to the carrier's Cerpack with the Background command whenever we
> received an incoming call. This got two way RTP set up and allowed the
> progress tones to be correctly passed through to the user.
> [noringback]
> exten => _X.,1,Background(/var/lib/asterisk/custom-sounds/silence_200,n)
> exten => _X.,2,Goto(incoming, ${EXTEN}, 1)
> Regards,
> Greyman.
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