[Freeswitch-users] Silence suppression again

[Alex Lake]

Thanks.
I've been looking at the channel variables of the call. And this is part 
of it:

<rtp_audio_in_raw_bytes>1089091</rtp_audio_in_raw_bytes><rtp_audio_in_media_bytes>957212</rtp_audio_in_media_bytes><rtp_audio_in_packet_count>10344</rtp_audio_in_packet_count><rtp_audio_in_media_packet_count>5581</rtp_audio_in_media_packet_count><rtp_audio_in_skip_packet_count>5480</rtp_audio_in_skip_packet_count><rtp_audio_in_jb_packet_count>0</rtp_audio_in_jb_packet_count><rtp_audio_in_dtmf_packet_count>0</rtp_audio_in_dtmf_packet_count><rtp_audio_in_cng_packet_count>4323</rtp_audio_in_cng_packet_count><rtp_audio_in_flush_packet_count>440</rtp_audio_in_flush_packet_count><rtp_audio_in_largest_jb_size>0</rtp_audio_in_largest_jb_size><rtp_audio_out_raw_bytes>1829908</rtp_audio_out_raw_bytes><rtp_audio_out_media_bytes>1829908</rtp_audio_out_media_bytes><rtp_audio_out_packet_count>10639</rtp_audio_out_packet_count><rtp_audio_out_media_packet_count>10639</rtp_audio_out_media_packet_count><rtp_audio_out_skip_packet_count>0</rtp_audio_out_skip_packet_count><rtp_audio_out_dtmf_packet_count>0</rtp_audio_out_dtmf_packet_count><rtp_audio_out_cng_packet_count>0</rtp_audio_out_cng_packet_count><rtp_audio_rtcp_packet_count>0</rtp_audio_rtcp_packet_count><rtp_audio_rtcp_octet_count>0</rtp_audio_rtcp_octet_count>

The thing that slightly concerns me here is 
<rtp_audio_in_cng_packet_count>4323</rtp_audio_in_cng_packet_count>

That sounds as though the inbound audio path contains some comfort 
noise, suggesting that the handset the other end has some kind of 
silence suppression enabled.

I'm afraid it's a dreaded Grandstream GXP2000 - which I know are not the 
handset of the cognoscenti! - but the customer tells me that he has 
silence suppression disabled. Do we think this is correct?!

Rgds,
Alex
> It does not send any by default.  Also, yes it only generates silence 
> when the call is not getting any RTP.
>
>
>
> On Tue, Feb 26, 2013 at 12:00 PM, Alex Lake <alex at digitalmail.com 
> <mailto:alex at digitalmail.com>> wrote:
>
>     Does Freeswitch enable any kind of silence suppression by default?
>     If I
>     have bridge_generate_comfort_noise=true, does that only have an effect
>     when the audio-generating end decides to stop sending RTP?
>
>     Any other tips for diagnosing silence (it's kind of like a slow noise
>     gate effect)?
>
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