[Freeswitch-users] Receiving faxes over sip trunk

[Tahir Almas]

David  has  explained  it very well

We have   similar  experience   while working with Freeswitch based open
source projects  ICTFax http://www.ictfax.org   that if  QoS  parameters
 like latency, jitter ,  packet error  rate  are within  limits  ,  Fax
over Ip transmission over T.38  is  reliable however  we  have  not  tested
 concurrent  capacity  with T.38 faxing  yet  and  we will be interested
 to  know  if someone share  such  results

We successfully tested 500  concurrent Faxes  over T.38 using  Asterisk
however  it will be interested to know free-switch  results

regards

*Tahir Almas*

Managing Partner
ICT Innovations
http://www.ictinnovations.com
Leveraging open source in ICT


On Wed, Aug 19, 2015 at 6:37 PM, David Witham <david.witham at netsip.com.au>
wrote:

> We operate fax2email services as well as end-to-end fax transmission using
> FreeSWITCH. There are a few things to be wary of:
>
>
> 1) If you are connecting over a public network, either to your customer or
> to your provider, t.38 on that leg is your only reliable solution. You can
> gateway between t.38 and G711 using FreeSWITCH if you have different needs
> on each leg. We have found this to work reliably.
>
>
> 2) Find out whether your provider supports t.38 or not and find out as
> much as you can about their network topology. With the way some providers
> deploy their networks, t.38 is the only viable solution. With others, where
> there may be only one or two hops from an ISDN gateway to your FreeSWITCH,
> G711 can work very well. Its also faster than t.38. We've also found
> providers with a VoIP only call path and who manage their networks well we
> can reliably use G711. For us we pick and choose whether to use t.38 or not
> based on the capability of the provider.
>
>
> 3) If you have private links to your customers go with G711. There is a
> lot of CPE that has poor t.38 support and it causes more problems than it
> solves.
>
>
> 4) When using G711, particularly to CPE, turn off any features that
> manipulate the media stream - adaptive jitter buffers, echo cancellation,
> silence suppression, fax-relay/bypass. You want an unadulterated G711
> stream for it to have the best chance of success. With the right network
> connections G711 works very well.
>
>
> David Witham​
> ------------------------------
> *From:* freeswitch-users-bounces at lists.freeswitch.org <
> freeswitch-users-bounces at lists.freeswitch.org> on behalf of Jai Rangi <
> jprangi at didforsale.com>
> *Sent:* Thursday, 20 August 2015 02:31
> *To:* FreeSWITCH Users Help
> *Subject:* Re: [Freeswitch-users] Receiving faxes over sip trunk
>
> Mike,
> We are using Fax on freeswitch for some clients for receiving as well as
> sending faxes. Have not seen any problem except few incidents here and
> there.
>
> -Jai Rangi
> www.didforsale.com
>
> On Wed, Aug 19, 2015 at 7:47 AM, Michael T Mowatt <mmowatt at nexxphase.com>
> wrote:
>
>> HI all,
>>
>>                 Was wondering if anyone is using FreeSWITCH to receive
>> faxes over a SIP trunk, and what the experience has been like.  I know I’ve
>> heard this can be difficult, but was interested in real experiences.
>>
>>
>>
>> Thanks,
>>
>> Mike
>>
>>
>>
>> _________________________________________________________________________
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>
>
> _________________________________________________________________________
> Professional FreeSWITCH Consulting Services:
> consulting at freeswitch.org
> http://www.freeswitchsolutions.com
>
> Official FreeSWITCH Sites
> http://www.freeswitch.org
> http://confluence.freeswitch.org
> http://www.cluecon.com
>
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