[Asterisk-Users] Using rxfax over SIP

[David Gurr]

I have no analog line interfaces on my asterisk system, but I do have two UK
0870 numbers routed to two separate VoIP accounts (one with FWD, one with
gossiptel). Asterisk is configured to register with these accounts. I get
voice calls through just fine this way.

I thought I could get one of these 0870 numbers to route through to rxfax,
thus allowing folks to fax me directly.

I've set up the spandsp stuff accordingly, and sure enough the CLI shows
that the call is getting answered and rxfax is starting up, but then I get
the following messages and no fax:

    -- Executing SetVar("SIP/9304499-4208",
"FAXFILE=/var/spool/asterisk/fax/1090917308.5.tif") in new stack
    -- Executing RxFAX("SIP/9304499-4208", "$FAXFILE") in new stack
Jul 27 09:35:48 NOTICE[22545]: rtp.c:434 ast_rtp_read: Unknown RTP codec 96
received
Jul 27 09:35:49 NOTICE[22545]: rtp.c:434 ast_rtp_read: Unknown RTP codec 96
received

Here's the relevant section from my sip.conf:

	[gossiptel]
	secret=secret
	username=9304499
	host=sip.gossiptel.com
	type=peer
	dtmfmode=rfc2833
	fromuser=9304499
	fromdomain=sip.gossiptel.com

I've tried dtmfmode=inband too, with the same behaviour.

I've a sneaking suspicion that the PSTN->VoIP gateway needs to recognise the
call as a faxcall and do the signalling appropriately, and that Gossiptel
doesn't do this. If that's the case, anyone know of a gateway that does
handle fax?

Thanks

--
David Gurr
Congruity Ltd.