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

Stefano Bertuola stefano.bertuola at gmail.com
Wed Feb 27 16:01:22 UTC 2019


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
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