Fax integration with Cisco VGW and Fenestrae

[Bar1s]

Hi,

We trying to integrate Fenestrae Fax server with Cisco 2951 voice gateway. 

Call Sequence is like that. 

Fax Srv >>> sip>>>Cisco2951VGW>PRI interface> outside fax number> 

We did some config but unfortunately fax sending is disconnecting after couple of ringing. 

I have added config and debug ccsip all log.

Any idea of reason that cause?  

Disconnect Cause (CC)    : 16
Disconnect Cause (SIP)   : 200

Regards,

Baris.

[Jonathan Schulenberg]

My guess is the fax server doesn't like the ultra-low speed you're forcing the gateway to negotiate at.

 fax-relay ecm disable
 fax-relay sg3-to-g3
 fax rate 9600
 fax protocol t38 version 0 ls-redundancy 0 hs-redundancy 0 fallback none

Fax Server SDP Offer

Cisco IOS SDP Offer

v=0 o=Anonymous 2890844526 890844527 IN IP4 netbricks.com s=- c=IN IP4 10.17.28.16 t=0 0 m=audio 0 RTP/AVP 0 c=IN IP4 10.23.24.88 a=rtpmap:0 PCMU/8000 a=ptime:20 m=image 10010 udptl t38 a=T38FaxVersion:0 a=T38MaxBitRate:14400 a=T38FaxRateManagement:transferredTCF a=T38FaxMaxBuffer:14000 a=T38FaxMaxDatagram:1500 a=T38FaxUdpEC:t38UDPRedundancy m=image 10011 tcp t38 a=T38FaxVersion:3 a=T38MaxBitRate:33600 a=T38FaxRateManagement:transferredTCF

v=0 o=CiscoSystemsSIP-GW-UserAgent 443 2368 IN IP4 10.23.24.88 s=SIP Call c=IN IP4 10.23.24.88 t=0 0 m=audio 0 RTP/AVP 0 c=IN IP4 10.23.24.88 a=rtpmap:0 PCMU/8000 m=image 28236 udptl t38 c=IN IP4 10.23.24.88 a=T38FaxVersion:0 a=T38MaxBitRate:9600 a=T38FaxRateManagement:transferredTCF a=T38FaxMaxBuffer:200 a=T38FaxMaxDatagram:320 a=T38FaxUdpEC:t38UDPRedundancy m=image 0 tcp 0 c=IN IP4 10.23.24.88 a=T38FaxVersion:3 a=T38MaxBitRate:33600 a=T38FaxRateManagement:transferredTCF

Also somewhat interesting is the fact that the fax server didn't specify a c= line for the m= line. Anyway, it's the fax server that issued the BYE so look at the logs on that side.