Hi,
i set faxopt(gateway)=yes and t38pt_udptl = yes,redundancy,maxdatagram=400 in sip.conf for the peer.?
But still asterisk is sending?SIP 200 OK message with G711 and G729 codec in SDP as reply to T38 invite.
Everything will be fine if ?itis ?possbile to send SIP 488 when asterisk ?receives T38 invite. ?that is why i tried??t38pt_udptl = no
Best Regards
________________________________
From: Gregory Massel <greg at csurf.co.za>
To: asterisk-ss7 at lists.digium.com
Sent: Tuesday, August 26, 2014 9:35 AM
Subject: Re: T38 fax issue
See https://wiki.asterisk.org/wiki/display/AST/T.38+Fax+Gateway
Particularly the line:
exten => 1,n,Set(FAXOPT(gateway)=yes) which you need on the SIP side of the DAHDI-SIP bridge
On 2014/08/26 08:01 AM, Huseyin Kaya wrote:
Hello
>
>
>Does anyone has a working libb7 server that able to handle T38 faxing.
>
>
>I am working on this for the last 10 days. But still no solution.?
>
>
>I am receiving the call from sip and sending to telco with ss7.?
>
>
>At the beginning of the call everything is fine ( i mean codec negotiation) . Then the remote sip side detects the fax tone that remote end sends and ?Then the sip remote side sends the t38 invite and asterisk sends SIP 200 OK message with G711 and G729 codec in SDP.
>
>
>My customer is saying that if i am sending SIP 200 OK to his T38 invite .in SDP of SIP 200 OK there should be only T38.
>?
>
>
>Also disabling t38 with t38pt_udptl=no didnt change anything. ?Still asterisk is sending?SIP 200 OK message with G711 and G729 codec in SDP as reply to T38 invite.
>
>
>
>
>I will be glad if current libss7 users can advice me a way to find a solution on this issue
>
>
>Regards
>
>
>?
>
>________________________________
> From: Huseyin Kaya <huseyinkaya at yahoo.com>
>To: Kaloyan Kovachev <kkovachev at varna.net>; "asterisk-ss7 at lists.digium.com" <asterisk-ss7 at lists.digium.com>
>Sent: Friday, August 22, 2014 5:32 PM
>Subject: Re: [asterisk-ss7] T38 fax issue
>
>
>
>Hello
>
>Actually it will be fine If I can send sip 488 not acceptable here to the re invite of t38 .
>But Asterisk is sending sip 200 ok with voice codecs in SDP.
>So if i was able to send sip 488 . The fax will contunie with g711
>Setting faxopt(gateway)=yes and t38pt_udptl = yes,redundancy,maxdatagram=400 didnt work.
>By setting these asterisk should send sip 200 with SDP T38 but it is still sending speech codec(g11u,etc..) in SIP 200 sdp.
>Also disabling t38 with t38pt_udptl=no didnt change anything.
>
>
>Regards
>
>
>
>
>________________________________
> From: Kaloyan Kovachev <kkovachev at varna.net>;
>To: Huseyin Kaya <huseyinkaya at yahoo.com>; <asterisk-ss7 at lists.digium.com>;
>Subject: Re: [asterisk-ss7] T38 fax issue
>Sent: Fri, Aug 22, 2014 1:52:44 PM
>
>
>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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