Done them!
Alex,
I suspect these pages would be a good place to start: http://wiki.freeswitch.org/wiki/VAD_and_CNG http://wiki.freeswitch.org/wiki/Variable_suppress_cng
-MC
On Thu, Feb 28, 2013 at 12:57 AM, Alex Lake <alex@digitalmail.com <mailto:alex@digitalmail.com>> wrote:
Ah! I think that has fixed it. Many thanks. I'll see if I can update a bit of wiki somewhere...
suppress_cng=true variable or supress-cng profile param set to true.
On Wed, Feb 27, 2013 at 11:44 AM, Alex Lake <alex@digitalmail.com <mailto:alex@digitalmail.com>> wrote:
A quick update on this - I have verified that suppresion of silence suppression(!) on Grandstreams doesn't work when it is the B-Party of a call. I'm not sure if silence-suppression is part of the SIP handshake, but I know that other VOIP technologies seem to be able to prevent it. I'm calling in a handset specialist to advise..
One of the things that intrigues me is this extract from the log (particularly the reference to silenceSupp):
2013-02-27 17:28:05.151624 [DEBUG] switch_core_codec.c:244 sofia/internal/0253302@004-0253.sb12.dmclub.org <mailto:sofia/internal/0253302@004-0253.sb12.dmclub.org> Restore previous codec PCMA:8. 2013-02-27 17:28:05.151624 [DEBUG] mod_sofia.c:754 Local SDP sofia/internal/0253302@004-0253.sb12.dmclub.org <mailto:sofia/internal/0253302@004-0253.sb12.dmclub.org>: v=0 o=FreeSWITCH 1361975871 1361975873 IN IP4 176.58.88.201 s=FreeSWITCH c=IN IP4 176.58.88.201 t=0 0 m=audio 10212 RTP/AVP 8 101 a=rtpmap:8 PCMA/8000 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-16 a=silenceSupp:off - - - - a=ptime:30 a=sendrecv
What does all this mean?
From the "A" leg of the call (which is placed by a LinkSys SPA922) I have:
<sip_local_sdp_str>v%3D0%0Ao%3DFreeSWITCH%201361974765%201361974767%20IN%20IP4%20176.58.88.201%0As%3DFreeSWITCH%0Ac%3DIN%20IP4%20176.58.88.201%0At%3D0%200%0Am%3Daudio%2011468%20RTP/AVP%208%20101%0Aa%3Drtpmap%3A8%20PCMA/8000%0Aa%3Drtpmap%3A101%20telephone-event/8000%0Aa%3Dfmtp%3A101%200-16%0Aa%3DsilenceSupp%3Aoff%20-%20-%20-%20-%0Aa%3Dptime%3A30%0Aa%3Dsendrecv%0A</sip_local_sdp_str>
From the troublesome "B" leg of the call (placed by FreeSwitch to my GXP2000) I have:
sip_local_sdp_str>v%3D0%0Ao%3DFreeSWITCH%201361974745%201361974746%20IN%20IP4%20176.58.88.201%0As%3DFreeSWITCH%0Ac%3DIN%20IP4%20176.58.88.201%0At%3D0%200%0Am%3Daudio%2011488%20RTP/AVP%208%20101%2013%0Aa%3Drtpmap%3A101%20telephone-event/8000%0Aa%3Dfmtp%3A101%200-16%0Aa%3Dptime%3A30%0Aa%3Dsendrecv%0Am%3Daudio%2011488%20RTP/AVP%208%203%20101%2013%0Aa%3Drtpmap%3A101%20telephone-event/8000%0Aa%3Dfmtp%3A101%200-16%0Aa%3Dptime%3A20%0Aa%3Dsendrecv%0A</sip_local_sdp_str>
I was wondering if there's a way I can modify this to include a="silenceSupp:off - - - -" and whether that would make the slightest bit of difference to the handset's behaviour!
Alex
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@digitalmail.com <mailto:alex@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)?
_________________________________________________________________________ Professional FreeSWITCH Consulting Services: consulting@freeswitch.org <mailto:consulting@freeswitch.org> http://www.freeswitchsolutions.com
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_________________________________________________________________________ Professional FreeSWITCH Consulting Services: consulting@freeswitch.org <mailto:consulting@freeswitch.org> http://www.freeswitchsolutions.com
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No virus found in this message. Checked by AVG - www.avg.com <http://www.avg.com> Version: 2012.0.2238 / Virus Database: 2641/5634 - Release Date: 02/26/13
_________________________________________________________________________ Professional FreeSWITCH Consulting Services: consulting@freeswitch.org <mailto:consulting@freeswitch.org> http://www.freeswitchsolutions.com
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No virus found in this message. Checked by AVG - www.avg.com <http://www.avg.com> Version: 2012.0.2238 / Virus Database: 2641/5635 - Release Date: 02/26/13
_________________________________________________________________________ Professional FreeSWITCH Consulting Services: consulting@freeswitch.org <mailto:consulting@freeswitch.org> http://www.freeswitchsolutions.com
FreeSWITCH-powered IP PBX: The CudaTel Communication Server http://www.cudatel.com
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FreeSWITCH http://www.freeswitch.org/ ClueCon http://www.cluecon.com/ Twitter: http://twitter.com/FreeSWITCH_wire
AIM: anthm MSN:anthony_minessale@hotmail.com <mailto:MSN%3Aanthony_minessale@hotmail.com> GTALK/JABBER/PAYPAL:anthony.minessale@gmail.com <mailto:PAYPAL%3Aanthony.minessale@gmail.com> IRC: irc.freenode.net <http://irc.freenode.net> #freeswitch
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_________________________________________________________________________ Professional FreeSWITCH Consulting Services: consulting@freeswitch.org <mailto:consulting@freeswitch.org> http://www.freeswitchsolutions.com
FreeSWITCH-powered IP PBX: The CudaTel Communication Server http://www.cudatel.com
Official FreeSWITCH Sites http://www.freeswitch.org http://wiki.freeswitch.org http://www.cluecon.com
FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org <mailto:FreeSWITCH-users@lists.freeswitch.org> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org
No virus found in this message. Checked by AVG - www.avg.com <http://www.avg.com> Version: 2012.0.2238 / Virus Database: 2641/5636 - Release Date: 02/27/13
_________________________________________________________________________ Professional FreeSWITCH Consulting Services: consulting@freeswitch.org <mailto:consulting@freeswitch.org> http://www.freeswitchsolutions.com
FreeSWITCH-powered IP PBX: The CudaTel Communication Server http://www.cudatel.com
Official FreeSWITCH Sites http://www.freeswitch.org http://wiki.freeswitch.org http://www.cluecon.com
FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org <mailto:FreeSWITCH-users@lists.freeswitch.org> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org
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_________________________________________________________________________ Professional FreeSWITCH Consulting Services: consulting@freeswitch.org http://www.freeswitchsolutions.com
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No virus found in this message. Checked by AVG - www.avg.com <http://www.avg.com> Version: 2012.0.2238 / Virus Database: 2641/5638 - Release Date: 02/28/13