Summary:ASTERISK-09084: T38 outbound
Reporter:Giovanni (mindthegap)Labels:
Date Opened:2007-03-23 09:21:37Date Closed:2008-02-14 13:15:40.000-0600
Versions:Frequency of
Environment:Attachments:( 0) full
( 1) sip_debug
Description:Asterisk 1.4.1 rpm with NAT upgraded to 1.4.2
ATA (Wellgate 3701B) with T38 connects to Asterisk (ext 401)
t38pt_udptl= yes both in sip.conf and extension

Receiving faxes: OK
Sending faxes: first page gets sent, then line goes down
In Asterisk full log a ""RTP re-invite after T38 session not handled yet" gets logged

If I set canreinvite=yes to canreinvite=no, nothing works (not even receiving).

The firewall statically nats ports 5060/5060 and 4000-4999 and 8000 to 20000 to the asterisk box.
Comments:By: Joshua C. Colp (jcolp) 2007-03-23 10:41:37

sip debug, udptl debug, and console output is needed for this. Please attach them.

By: Giovanni (mindthegap) 2007-05-18 11:39:11

The Full Log attached show a Fax Out attempt with branch version 1.4-R64904
Only the first page gets sent and then communication is dropped.
Both ATA (WllGate 3701B, IP, Ext. 401) and Asterisk ( are behind a NAT (natting configured correctly, a receive attempt went fine for 2 pages).
Dialled number is 0512965749 (Physical Fax connected to a landline).

With this branch an illegal media type gets logged after first page sending.
Full log with set verbose 5, set debug 5, sip debug and udptl debug attached

By: Patrick Anderson (panderson) 2007-06-05 17:28:53

Attached a sip debug from a customer who is experiencing the same issue, at their request. Customer is using a Linksys SPA2102 ATA and t38pt_udptl=yes, canreinvite=yes.

By: Joshua C. Colp (jcolp) 2008-02-14 13:15:39.000-0600

After looking over things, comparing old code/new code, and trying a few things I am confident this issue no longer exists in the current 1.4 tree.