[asterisk-users] sending T.38 fax negotiation problem

[Miguel Amez]

Hi,

I'm experiencing the same problem with t38modem and hylafax.
My problem is that on the re-Invite phase it syncs lower than 2400 bpps and
the connection hangs on the second page.

Could you please post here the patch for asterisk 1.6.2.4 or even indicate
which is the trunk of asterisk where this patch take effect?

thanks a lot,

Miguel Amez.

2010/5/3 Kevin P. Fleming <kpfleming at digium.com>

> On 05/03/2010 11:59 AM, Ilmars Knipshis wrote:
>
> > Problem in short is as following:
> > after reINVITE from Cisco to negotiate T.38:
> >
> > <--- SIP read from UDP:193.110.9.17:5060 --->
> > INVITE sip:37166101111 at 159.148.78.220 <sip%3A37166101111 at 159.148.78.220>SIP/2.0
> > Via: SIP/2.0/UDP 193.110.9.17:5060
> > From: <sip:3250890229 at 193.110.9.17 <sip%3A3250890229 at 193.110.9.17>
> >;tag=74ff1200077fff10ff000018ff29ff16
> > To: "37166101111" <sip:37166101111 at 159.148.78.220<sip%3A37166101111 at 159.148.78.220>
> >;tag=as32fabaec
> > Call-ID: 46ba3dad03495f6f35426980334703d3 at 159.148.78.220
> > CSeq: 103 INVITE
> > Contact: <sip:3250890229 at 193.110.9.17 <sip%3A3250890229 at 193.110.9.17>
> ;user=phone>
> > Max-Forwards: 10
> > User-Agent: MERA MSIP v.1.0.2
> > Content-Type: application/sdp
> > Content-Length:   183
> >
> > v=0
> > o=- 1272610573 1272610573 IN IP4 193.110.9.17
> > s=-
> > c=IN IP4 193.110.9.17
> > t=0 0
> > m=image 25296 udptl t38
> > a=T38FaxRateManagement:transferredTCF
> > a=T38FaxUdpEC:t38UDPRedundancy
>
> The problem here is being caused by the re-INVITE occurring prior to
> SendFAX() being started; this really should not be happening, as the
> other endpoint should not re-INVITE until it knows that a FAX endpoint
> is calling, but some of them do this anyway.
>
> There is a fix for this problem in SVN Asterisk trunk already, and it
> will be merged into the 1.6.2 branch in the next couple of weeks.
>
> --
> Kevin P. Fleming
> Digium, Inc. | Director of Software Technologies
> 445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
> skype: kpfleming | jabber: kfleming at digium.com
> Check us out at www.digium.com & www.asterisk.org
>
> --
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