[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]

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\$127.0.0.1:6060 --ptty +/dev/ttyT380,+/dev/ttyT381 --route
'modem:.*=sip:<dn>@127.0.0.1:5061' --route 'sip:.*=modem:<dn>'
--sip-register 91 at 127.0.0.1:5061,password

I tried it with a global IP (instead of 127.0.0.1) - 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.

The extension is a normal pjsip extension with these additional options:


 t38_udptl                          : true
 t38_udptl_ec                       : redundancy
 t38_udptl_ipv6                     : false
 t38_udptl_maxdatagram              : 400
 t38_udptl_nat                      : no (or yes - doesn't matter)


The trunk looks exactly the same:

 t38_udptl                          : true
 t38_udptl_ec                       : redundancy
 t38_udptl_ipv6                     : false
 t38_udptl_maxdatagram              : 400
 t38_udptl_nat                      : no (or yes - doesn't matter)



Thanks,
Michael