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

[Daniel Greenwald]

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]
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