[asterisk-dev] PJSIP on Asterisk 16 doesn't send t38 packets when sending via res_fax module.

[Steve Sether]

This is in fact the exact problem.  We use local channels when sending out faxes.

Thanks for your quick reply.

On Tue, Dec 1, 2020 at 6:23 PM Steve Sether <ssether at usinternet.com  <http://lists.digium.com/mailman/listinfo/asterisk-dev>> wrote:

>/I'm having a lot of trouble getting PJSIP to send a fax via T.38 in />/Asterisk 16.14.1. />//>/From the pcap, I see the call being made, it connects, RTP goes in both />/directions, the far-end requests a re-invite using t.38, Asterisk sends />/an OK, the OK is acked, and the far ends starts sending t.38 packets, />/asterisk stops sending RTP. />//>/Then Asterisk basically sends nothing else. No T.38 packets are sent by />/Asterisk, No SIP, nothing. The far end eventually gives up sending />/t.38, and sends a bye, ending the call. />//
Do you have a Local channel in the mix? If so then there is a known
issue[1] which is being worked on.

[1]https://issues.asterisk.org/jira/browse/ASTERISK-29035

-- 
Joshua C. Colp
Asterisk Technical Lead
Sangoma Technologies
Check us out at www.sangoma.com and www.asterisk.org

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