[cisco-voip] SIP signal

[Santiago Figueroa]

Hello experts


I have a question with SIP to do work ringback, I have this step of signal SIP but do not if this is the instruction to PSTN hear ringback? My problem is that PSTN do not hear ringback.



SIP/2.0 180 Ringing
Via: SIP/2.0/UDP 207.249.152.70:5060;branch=z9hG4bK*002e-00005424-07c1,SIP/2.0/UDP  10.15.15.7:5060;branch=z9hG4bK45F12EA
From: <sip:8181113405 at 10.15.15.7>;tag=9D58538-D02
To: <sip:335518400 at 207.249.152.75>;tag=7B104564-2709
Date: Mon, 17 Oct 2011 22:50:25 GMT
Call-ID: C839BDD3-F84611E0-89E8ACDE-1882742B at 10.15.15.37<mailto:C839BDD3-F84611E0-89E8ACDE-1882742B at 10.15.15.37>
Timestamp: 1318890771
CSeq: 101 INVITE
Require: 100rel
RSeq: 4915
Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY, INFO, REGISTER
Allow-Events: telephone-event
Remote-Party-ID: "B Ivr Q" <sip:8451 at 10.14.208.19>;party=called;screen=no;privacy=off
Contact: <sip:3325518400 at 10.14.208.19:5060>
Record-Route: <sip:Gk-int at 207.249.152.75:5060;lr>
Server: Cisco-SIPGateway/IOS-12.x
Content-Length: 0

can anyone help me?

Thanks.



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