[cisco-voip] AS5300 PSTN->SIP ringback question

[Robert Boyle]

Hello all,

I have an AS5300 running 12.3(13) with 549 DSPs and an NI PRI. SIP->PSTN 
and PSTN->SIP calls work perfectly. The problem is that I don't get any 
ringback when dialing PSTN->SIP because the call is still not setup. The 
AS5300 doesn't pick up and establish the call until it negotiates an RTP 
stream. That negotiation doesn't happen during the notify or the ringing of 
the SIP phone, but only after it is picked up which may be 30-60 seconds or 
until it is forwarded to voicemail. Once either event happens, the RTP 
stream is established and the call begins. Is there a way to tell the 
AS5300 to either - tell the phone company to generate ringback during the 
SIP alerting and negotiation phase - or - have the AS5300 pick up the call 
and generate ringback then transfer the call once the called party answers 
(or voicemail answers)? Any help or sample configs would be appreciated. 
Thank you!

-Robert


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