[Freeswitch-users] Major deployment of outbound FAX on latest version of Freeswitch question

[Juan Antonio Ibañez Santorum]

Thank you very much for your answer Steve.

Would be FS + mod_spandsp good both for incoming and outgoing faxeds?

What could be achieved to avoid media timing issues you told?

Regards


2011/5/9 Steve Underwood <steveu at coppice.org>

> On 05/09/2011 01:16 AM, Juan Antonio Ibañez Santorum wrote:
> > How much reliable FS + mod_spandsp is compared to other solutions
> > (open source or not)?
> The open source options are:
>
>     Asterisk + spandsp
>     Asterisk + Hylafax + iaxmodem + spandsp
>     Freeswitch
>
> These are all tested and proven to give well below 1% failures, even
> with quite a lot of concurrent FAX channels in use, if things are set up
> well. They can give you bad failure rates if things are not set up well.
> I believe that right now you will have less trouble achieving a reliable
> setup with Freeswitch. Going forward, most of my effort goes into making
> the Freeswitch option the most thoroughly implemented one.
>
> The main commercial option is:
>
>     Asterisk + Digium's commercial FAX
>
> Of course, there are numerous other fully commercial FAXing options
> which could be used in conjunction with things like Asterisk or Freeswitch
>
> The Digium FAX module is based on the well known Commetrex FAX engine,
> which is widely deployed, and should be capable of solid results.
> However, the module is more than just the core FAX engine, and some
> people do have serious trouble with the module. I have helped moved
> people off this, and onto Asterisk + spandsp, to improve their
> reliability. In a couple of those cases people were getting quite a lot
> of pages cut short when receiving FAXes with T.38, even though a
> wireshark log showed a perfect exchange, from which I could correctly
> decode these FAXes. The module was not reporting any errors. In a couple
> of cases strange machines were sending weird things the Digium FAX
> didn't cope with very well. I worked with these people to make sure
> spandsp did handle the weird stuff well, and we ended up with a more
> usable solution. These people told me that when they complained to
> Digium they got little help. The best was an offer of a refund. Paying
> to get some support didn't seem to work out too well for these people,
> but I guess if the support you are looking for is mostly in getting
> things configured and working on day one you might get value for money.
>
> All these solutions require reliable signaling and reliable media
> timing, and many people have setups which cannot achieve that. Most
> people don't understand how things work, and will claim a solution
> doesn't function for spurious reasons. For example, a number of people
> say the spandsp module for Asterisk doesn't work, because they keep
> getting a 488 response. That response has nothing to do with the FAX
> engine. It is a negotiation error that occurs outside the FAX engine. If
> they fixed their configuration the error would go away. However, many
> just move on, having "proven" to themselves the solution doesn't work.
>
>
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