SIP SDP issue to ISP from Cisco gateway

[rynard.coetzee]

Hi

I have an issue getting the following to work ,i have Call Manager 4 server with an H323 gateway configured. On the H323 gateway i have SIP dial-peer pointing to ISP. When i dial a number it rings once on the device and then disconnects ,from the debugs on my gateway i get the following error :

020626: Feb 11 07:40:22.961: //116594/0039642B1A66/SIP/Error/sipSPIDoAudioNegoti

ation: Media negotiation failed for m-line 1

According to the ISP tech they are saying that my SIP replies do not have an SDP in the initial Invite with the configured codec ,although i have a static codec entry on my SIP dial-peer. Any ideas ?

[Thomas Dominic]

Hi,

You need to configure SIP earlyy offer, thats what the ISP tech is talking about. The below document should help you out.

http://www.cisco.com/en/US/docs/ios/voice/cube/configuration/guide/vb-gw-sipsip.html#wp1443323

Regards

Thomas

P.S. Please rate helpful posts

[rynard.coetzee]

Hi

Thanks for the reply ,i have Early offer configured under the dial-peer here is my dial-peer config

dial-peer voice 102 voip

translation-profile outgoing VOX

destination-pattern 0726157245

voice-class codec 1

voice-class sip early-offer forced

session protocol sipv2

session target ipv4:41.193.38.14

dtmf-relay rtp-nte

[Thomas Dominic]

What codec is the telco expecting, configure the same codec appropriately here..

[rynard.coetzee]

According to Telco the expecting G729

So i have Voice class codec 1 - with pref 1 G729r8 and pref 2 G729br8

This is tied to my dial-peer.