[Freeswitch-users] issue with quintum tenor and bridge_generate_comfort_noise

[Matthew Meek]

We are migrating to using FS as an SBC between a telco and our Oracle
Call Center Anywhere platform. Our current production calls are on a
Quintum Tenor gateway using PRIs and we are moving to SIP via the SBC.
The telco has a 5 minute RTP watchdog, and when Agents are working
off-hook the RTP stream stops, requiring us to use
bridge_generate_comfort_noise=true on the Agent leg. This works great as
long as the inbound and outbound calls are both via SIP/Freeswitch. When
the inbound call is via the Quintum Tenor (H323 to the CCA platform) and
outbound is via the SIP/Freeswitch SBC, we get audio quality issues. The
quality issue sounds like an overly-aggressive or poorly implemented
VAD, where when the customer takes a small pause to talk, his or her
voice is chopped for an instant when they begin speaking again.  This is
mostly apparent when the customer is reading off numbers... 

 

I do not understand why FS would be behave differently depending on the
origin of the inbound call, as I am only adding
bridge_generate_comfort_noise=true to the outbound call leg. 

 

Freeswitch is acting as a B2BUA SBC.

 

I have packet captures on the outside interface of the SBC and can hear
the audio issue in wireshark. 

 

Any thoughts? Thanks,

 

Matthew Meek

 

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