[asterisk-biz] SIP Fax OK?

[Andres Paglayan]

On Aug 7, 2007, at 12:21 PM, Matthew Rubenstein wrote:

> On Tue, 2007-08-07 at 13:38 -0400, Andrew Joakimsen wrote:
>> On 8/6/07, Matthew Rubenstein <email at mattruby.com> wrote:
>>>         According to Xorcom's press release advertising their  
>>> reliable Asterisk
>>> Fax/ZAP solution
>>> ( http://www.xorcom.com/documentation/white_papers/fax_modem ), the
>>> problem Asterisk has with mediating faxes is Zaptel timer desync
>>> problems. So does that mean that Asterisk can reliably receive  
>>> and send
>>> faxes when connected to the PSTN by SIP (or IAX) to a gateway  
>>> switch?
>>> --
>>>
>>
>> Yes, if all the SIP endpoints support ITU-T Recommendation T.38. The
>> problem is there is no such thing right now in Asterisk and no plans
>> by Digium to add it.

Is thinking of using callweaver something you may consider?

>>
>> If you have a SIP provider supporting T.38 then you can have calls
>> from your T.38 capable devices forwarded to that provider, but you
>> must use Asterisk 1.4 and pray it works.
>
> 	Thanks for the clear, concise - and quick - reply. I think my  
> followup
> is more appropriate to the -users list, but I don't understand the
> protocol for crossposting, or somehow notifying the readers of this
> thread in this -biz list that I'm jumping. I'll repost there if  
> asked or
> advised.
>
> 	What does the SIP provider (SIP/PSTN gateway) have to do to support
> T.38? Is it just a question of all their gear between their TDM  
> network
> and the SIP gateway supporting T.38? Or do their operations have to do
> anything extra to support it, other than buying the right routers and
> enabling the right configs when deploying those routers?
>
> 	Also, the current T.38 "SIP Passthru" support in Asterisk means that
> Asterisk can connect two other SIP hosts (or two connections to eg. a
> single SIP/PSTN gateway host) that are carrying a call whose media
> content is just fax data, correct? But can't do anything but connect
> those endpoints (eg, save the fax on the Asterisk HD). But can that  
> call
> be recorded to Asterisk HD with the fax data intact, or can extra legs
> (muted) be connected to a "fax conference" that feeds multiple  
> receiving
> (POTS) faxes with the same incoming fax call data?
> -- 
>
> (C) Matthew Rubenstein
>
>
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Andres Paglayan

--"Harmony is more important than being right"
Bapak