[asterisk-users] Incoming Fax Issue with Asterisk 11.7 and Digium Fax

[Larry Moore]

On 3/02/2014 7:38 PM, Jakob-Matthias Böttger wrote:
> as He is describing it he should actually provide t.38. but i don't know
> why it is not working thus im now getting
>
> Feb 3 12:32:55] WARNING[9942][C-00000004]: chan_sip.c:10353 process_sdp:
> Failed to initialize UDPTL, declining image stream
> [Feb 3 12:32:55] WARNING[9942][C-00000004]: chan_sip.c:10497
> process_sdp: Insufficient information in SDP (c=)...
> and then the fax session starts recording data
>

In udptl.conf set use_even_ports=yes and then issue a reload.

You can confirm the settings have been applied by performing udptl show 
config.

Change the the t38 line to read as;

t38pt_udptl=yes,redundancy,maxdatagram=400

Reload sip and test.