[Asterisk-Users] Using rxfax over SIP

[Steve Underwood]

Hi David,

96 and up are dynamically allocated codecs, so more information is 
needed to tell what the codec really is. On the general topic of FAXing 
over VoIP did you look at http://www.opencall.org/faq ?

If your VoIP provider is half decent, they should be able to deliver FAX 
to you by T.38

Regards,
Steve

David Gurr wrote:

>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.
>
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