CUBE FAX protocol configuration assistance

[Thushara Dassanayake]

I have below call flow:

PSTN----(SIP)---->CUBE----(SIP)-->fax server

When inbound calls hit the fax server, mid of the sip communication cube send some errors.

*Jul 30 12:40:38.825: //-1/xxxxxxxxxxxx/SIP/Msg/ccsipDisplayMsg:
Sent:
SIP/2.0 488 Not Acceptable Media

Via: SIP/2.0/UDP 172.16.1.1:5060;branch=z9hG4bKdbmwada5ynwjozwbayympzluw;Role=3;Hpt=8ea8_16

From: <sip:112448323@172.25.80.250;user=phone>;tag=zmzsitnn-CC-30

To: <sip:0112023185@172.25.80.250;user=phone>;tag=1A3E0648-14A6

Call-ID: isbciklknnzjirn336lsi3msktth4kjtio6i@SoftX3000

Warning: 304 172.25.80.250 "Media Type(s) Unavailable"

CSeq: 1 INVITE

Content-Length: 0

Please find the attached sip trace,

Calling number: 112448323

called number: 0112023185

172.16.1.1--->PSTN Service Provider

172.25.80.250--->CUBE

192.168.190.230--->Fax Server

[Anthony Holloway]

Could you show your IOS version, voice service voip, debug voip ccapi inout, and your relevant dial-peer configs?

Do you know if your are configured for, and all three parties support T.38 Fax Relay, or possibly pass through, since the call did not arrive at your gateway with T.38 attributes?

I wonder if you're hitting this defect:
https://bst.cloudapps.cisco.com/bugsearch/bug/CSCub24691/?rfs=iqvred

You could try upgrading your code, but let's look at debugs and config first.

[Thushara Dassanayake]

Dear Anthony,

Thank you very much for your quick response. I have made small configuration change. Please see the attached debugs and configuration files.

[Thushara Dassanayake]

configuration file