Hi, in addition to FAXOPT(gateway) you may try to request transmission medium from telco - see SS7_TMR or SS7_TMR_NUM, as it should be set on the outgoing (dahdi) channel you need to set it on the SIP channel with underscore (_SS7_TMR) The possible options are defined in libss7.h and SS7_TMR_3K1_AUDIO (or 3 as num) works fine here. If you can detect the fax calls you may request 64K_UNRESTRICTED data for them On 2014-08-22 15:47, Huseyin Kaya wrote: > Hello > > I am using Sangoma A104DE with libss7 on Asterisk 11.5.0 and > terminating calls to telco with ss7 . We are using patched version of > Libss7 that have timers > functionality.(https://issues.asterisk.org/jira/browse/SS7-27) > > The server is on production for the last 6 months and everything was > fine > > My interconnection with telco is only one way. From sip to ss7 . > > Everything is fine except one thing. > > One of my customers asked for t38 faxing. then i found myself in > trouble. > > I get several sip traces and found the problem at the end .When i > receive an invite T38 , asterisk is sending 200 OK message but in SDP > it is sending g711u,g711a,g729 as codecs. So after this point > everything is messed up. > > I tried to set t38pt_udptl=no in sip.conf , but still asterisk is > sending sip 200 ok with sdp g711... > > ? tried to set t38pt_udptl = yes,redundancy,maxdatagram=400 and > setvar=FAXOPT(gateway)=yes,20 in sip.conf but still i couldn't manage > to receive fax > > So basically what i need to send fax from sip to telco but could not > manage to do till now. > > Everything except fax is working like a charm. > > Is anyone succeed to handle fax with libss7. > > I will be glad if an expert can show me a way to achive this. > > Best Regards
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