[Freeswitch-users] Sending t38 No-Signal packets while receiving a fax page with mod_spandsp

Brian West brian at freeswitch.com
Wed Nov 13 19:55:47 UTC 2019

Send me the details and I can expose that.

On Wed, Nov 13, 2019 at 11:45 AM Steve Underwood <coppice12 at gmail.com>

> On 11/13/19 6:03 PM, Daniel Greenwald wrote:
> > Anyone know if freeswitch can be made to send periodic No-signal
> > packets while receiving a page data pump? Carrier's SBC is hitting an
> > RTP timer during long page transfers because freeswitch/spandsp is
> > completely silent while receiving a page. Other T38 switches I've
> > noticed will send a No-Signal packet every 300ms seconds as a
> > keep-alive. This can be seen in the top screenshot below. Lower one is
> > freeswitch receiving a page silently.
> So, you've found yet another broken buggy system that doesn't follow
> standards. Surprise, surprise. If you find the person who made the
> system require no signal packets every 300ms can you find a 4x2 and wack
> them around the head with it for me, please?
> There is an option in spandsp itself to make it regularly repeat the
> indicator signals, to tolerate this kind of broken behaviour. I'm not
> sure if the Freeswitch module exposes that capability.
> Regards,
> Steve
> _________________________________________________________________________
> The FreeSWITCH project is sponsored by SignalWire https://signalwire.com
> Enhance your FreeSWITCH install with disruptive priced SMS and PSTN
> services.
> Build your next product on our scalable cloud platform.
> Join our online community to chat in real time
> https://signalwire.community
> Professional FreeSWITCH Services
> sales at freeswitch.com
> https://freeswitch.com
> Official FreeSWITCH Sites
> https://freeswitch.com/oss
> https://freeswitch.org/confluence
> https://cluecon.com
> FreeSWITCH-users mailing list
> FreeSWITCH-users at lists.freeswitch.org
> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
> UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
> https://freeswitch.com


Brian West | Co-founder and Developer

Need Commercial support? email sales at freeswitch.com

FreeSWITCH Solutions | 17345 Civic Drive #2531 Brookfield, WI 53045

Email: brian at freeswitch.com

Mobile: 918-424-9378

Website: https://www.FreeSWITCH.com <https://www.freeswitch.com/>

[image: https://www.facebook.com/signalwireinc?src=email]
<https://www.facebook.com/freeswitch> [image:
https://twitter.com/freeswitch] <https://twitter.com/freeswitch>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freeswitch.org/pipermail/freeswitch-users/attachments/20191113/d07e64db/attachment.html>

More information about the FreeSWITCH-users mailing list