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

[Daniel Greenwald]

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 at freeswitch.com> wrote:

> Send me the details and I can expose that.
>
> On Wed, Nov 13, 2019 at 11:45 AM Steve Underwood <coppice12 at 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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> Enhance your FreeSWITCH install with disruptive priced SMS and PSTN
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> Build your next product on our scalable cloud platform.
>
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>
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