[asterisk-users] Getting channel 'SIP/192.168.1.69-00000000' refused to negotiate T.38

[Ahmed Munir]

The configuration I did in Cisco Voice GW is listed below;

dial-peer voice 2852 voip
description Incoming Fax Calls to Asterisk
destination-pattern 329..
session protocol sipv2
session target ipv4:192.168.1.69
codec g711ulaw
fax protocol t38 ls-redundancy 0 hs-redundancy 0 fallback none

Please advise to overcome this warning.

On 06/22/2012 12:05 PM, Ahmed Munir wrote:
> >
> > Here is my setup;
> >
> > Fax machine -> PSTN -> Cisco Voice GW -> IP cloud -> Asterisk. As on
> > Cisco Voice GW, T.38 fax already configured on SIP protocol.
>
> Apparently your configuration of the 'Cisco Voice GW' was not
> successful, as it refused to accept a re-INVITE from Asterisk that
> wanted to switch the SIP channel to T.38 mode.
> --
> Kevin P. Fleming
>


> > Does your VoIP provider support t.38?
> >
> > Sent from my iPad
> >
> > On Jun 22, 2012, at 11:05 AM, Ahmed Munir <ahmedmunir007 at gmail.com>
> wrote:
> >
> > > Hi,
> > >
> > > I recently configured T.38 on Asterisk 10.4.2. When I send the fax to
> > Asterisk, it gives the errors as listed below;
> > >
> > >  WARNING[25986]: app_fax.c:442 transmit_audio: channel
> > 'SIP/192.168.1.69-00000000' refused to negotiate T.38
> > >  WARNING[25986]: app_fax.c:174 span_message: WARNING T.30 ECM carrier
> > not found
> > >
> > > As in sip.conf the configuration is listed below;
> > >
> > > t38pt_udptl = yes,fec,maxdatagram=400
> > > faxdetect = t38
> > >
> > > And the rest are the standard configuration.
> > >
> > > Please advise to resolve this issue.
> > >
> > > --
> > > Regards,
> > >
> > > Ahmed Munir Chohan
> > >
> >
>


-- 
Regards,

Ahmed Munir Chohan
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