[asterisk-users] asterisk 13.16 / pjsip / t.38: res_pjsip_t38.c:207 t38_automatic_reject: Automatically rejecting T.38 request on channel 'PJSIP/91-00000007'

Michael Maier m1278468 at mailbox.org
Mon Jun 5 09:49:25 CDT 2017

On 06/05/2017 at 11:30 AM, Joshua Colp wrote:
> On Sun, Jun 4, 2017, at 10:40 AM, Michael Maier wrote:
>> On 06/04/2017 at 01:41 PM Telium Technical Support wrote:
>>> Just a guess (without knowing about your network), but are the two ends
>>> points on public networks and visible to one another?  If not the reinvite
>>> may be passing an internal (nat'ed) address to the other and the connection
>>> will fail...just a though
>> t38modem -tt -o /var/log/t38modem.log --no-h323 -u 91 --sip-listen
>> udp\$ --ptty +/dev/ttyT380,+/dev/ttyT381 --route
>> 'modem:.*=sip:<dn>@' --route 'sip:.*=modem:<dn>'
>> --sip-register 91 at,password
>> I tried it with a global IP (instead of - same behavior.
>> The point is, that the receiving part, which initiates the t.38 switch,
>> doesn't sent the switch to the ISP. It is blocked / ignored by asterisk
>> at all - don't know why it isn't sent to the ISP.
> I'd suggest providing the console output and SIP traffic (pjsip set
> logger on) so we can see exactly what is going on.

I attached the debug output I already created before.

Interesting part starts around line 2740.

91 -> local pjsip fax-extension -> asterisk server local connect for fax-extension (->
not encrypted even if it is port 5061!)

external fax number at easybell (, which is called and
which is answered here: 11111222222

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