Sending t38 No-Signal packets while receiving a fax page with mod_spandsp
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. [image: image.png] [image: image.png]
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
Send me the details and I can expose that. On Wed, Nov 13, 2019 at 11:45 AM Steve Underwood <coppice12@gmail.com> wrote:
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
_________________________________________________________________________
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Wow Steve that's amazing! Can you point us to the option so we can see about enabling it in freeswitch? I've been looking through the spandsp source and unsure where this flag is. We just need to send some packets to prevent the 5 minute one-way RTP timer kicking in. Thanks! On Wed, Nov 13, 2019 at 3:31 PM Brian West <brian@freeswitch.com> wrote:
Send me the details and I can expose that.
On Wed, Nov 13, 2019 at 11:45 AM Steve Underwood <coppice12@gmail.com> wrote:
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@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@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@freeswitch.com
FreeSWITCH Solutions | 17345 Civic Drive #2531 Brookfield, WI 53045 <https://maps.google.com/?q=17345+Civic+Drive+%232531+Brookfield,+WI+53045&entry=gmail&source=g>
Email: brian@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> _________________________________________________________________________
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@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@lists.freeswitch.org http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users https://freeswitch.com
participants (3)
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Brian West
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Daniel Greenwald
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Steve Underwood