[asterisk-users] T38 negotiation, the last step !

[Xavier Cardil]

Sorry for responding so late. Does this mean that the fax is going to a
dialpeer that isn't being  configured to handle T.38 ? I'm trying to send
the faxes with just 1 entire number, so I don0t think the call is not
matching that dialpeer . . . .  any thoughts ?

On Fri, Jul 17, 2009 at 3:33 PM, Steve Underwood <steveu at coppice.org> wrote:

> Klaus Darilion wrote:
> > Xavier Cardil schrieb:
> >
> >> Hi, I've managed to get HYLAFAX---->T38MODEM----->
> >> ASTERISK---->CISCOAS5400 working, but when they are negotiating asterisk
> >> drops a message telling "Unknown RTP codec 96 received from gateway" Do
> >> somebody know how to fix it ?
> >>
> >> Thank you !
> >>
> >>
> >>
> >> << [ TYPE: Control (4) SUBCLASS: Ringing (3) ]
> [SIP/GWCISCO5400O-600bfcc8]
> >> << [ TYPE: Control (4) SUBCLASS: Answer (4) ]
> [SIP/GWCISCO5400O-600bfcc8]
> >> << [ TYPE: Null Frame (5) SUBCLASS: N/A (0) ]
> [SIP/GWCISCO5400O-600bfcc8]
> >> << [ TYPE: Null Frame (5) SUBCLASS: N/A (0) ]
> [SIP/GWCISCO5400O-600bfcc8]
> >> << [ TYPE: Control (4) SUBCLASS: T38/Negotiation Requested (19) ]
> >> [SIP/GWCISCO5400O-600bfcc8]
> >> << [ TYPE: Null Frame (5) SUBCLASS: N/A (0) ]
> [SIP/GWCISCO5400O-600bfcc8]
> >> [Jul 16 17:50:39] NOTICE[2736]: rtp.c:1739 ast_rtp_read: Unknown RTP
> >> codec 96 received from '192.168.3.163'
> >>
> >
> > Is '192.168.3.163' the Cisco GW? If yes, then it is probably an NSE
> > packet. NSE is a Cisco proprietary FaxoverIP solution and uses per
> > default payload types 96 and 97 to signal a changeover from VoIP to FoIP.
> >
> > Probably you have to configure the Cisco GW to use T.38 instead of NSE
> > for FoIP.
> >
> When did RFC2833 become a proprietary Cisco spec?
>
> The NSEs just signal the startup of FAX. You still need to switch into
> T.38 to actually exchange the FAX.
>
> Steve
>
>
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