[Freeswitch-users] iPhone (AMR) to PSTN (G.711) silent call issue - dropped

[Stefano Bertuola]

Hi experts.

I am using FS for transcoding a call between an iPhone (AMR codec used) to
a Cisco 880 Voice simulating PSTN (a legacy phone is connected here).

A call is initiated by iPhone and terminated to the fixed phone; if the B
side is silent (VAD enabled), the Cisco 880 stops sending RTP towards FS
and, then, FS to iPhone.

After 10sec not receiving RTPs, iPhone drops the call with "Reason:
SIP;cause=200;text="RTP Timeout" ".

I tried several options to make the FS not stopping sending RTPs towards
iPhone or any other possibility to avoid this issue, but I was not able to
get a workaround.

Any idea?

Br. Stefano
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freeswitch.org/pipermail/freeswitch-users/attachments/20190227/e8da756c/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: freeswitch.log
Type: application/octet-stream
Size: 42338 bytes
Desc: not available
URL: <http://lists.freeswitch.org/pipermail/freeswitch-users/attachments/20190227/e8da756c/attachment-0002.obj>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: iPhone_drop_2.pcap
Type: application/octet-stream
Size: 175726 bytes
Desc: not available
URL: <http://lists.freeswitch.org/pipermail/freeswitch-users/attachments/20190227/e8da756c/attachment-0003.obj>