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 <[email protected]> > 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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