thank you very much Tamas, i found this infos very useful :) -----Ursprüngliche Nachricht----- Von: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Im Auftrag von Tamas Gesendet: Samstag, 13. September 2008 14:31 An: [email protected] Betreff: Re: [Freeswitch-users] VAD and CN question
Hello, to answer for my own email - for other who might be interested... Tamas írta: > Hello, > > I've talked about CNG, VAD with Anthony and Brian already but I still > have a mess in it and don't really know how it works. > > Could anybody explain the practical side of these magic options? > > 1. What does suppress_cng=true do exactly? (yep, I know it suppresses > CNG, but what does this mean? Won't send out the CN/8000 rtpmap in SDP?) > suppress-cng and suppress_cng are used to manage the sending of CN RTP packets after agreement through SDP. > 2. What do VAD settings do in sofia profile? I've read > http://wiki.freeswitch.org/wiki/Sofia.conf.xml > > <!-- <param name="vad" value="in"/> --> > <!-- <param name="vad" value="out"/> --> > <!-- <param name="vad" value="both"/> --> > > What do these options do in practice? Can FS detect silence (e.g. no > RTP?) and than what can it do with? > When VAD is turnd on, FS checks on the given channel for incoming or/and outgoing channel (depends on the settings) and when detects silence, stops sending out RTP. > 3. I found undocumented options rtp_enable_vad_in, rtp_enable_vad_out > for sofia which might be the per call settings for point 2. ? If this is > correct, what will this do? > <action application="set" data="rtp_enable_vad_in=true"/> > <action application="set" data="rtp_enable_vad_out=true"/> > <action application="bridge" data="sofia/....."/> > These settings are the same as in 1. but can be used per call. > 4. What will FS do when one side of the bridge supports CN but the other > doesn't? > E.g. softphone->FS->GW (sends CN packets) > the softphone does not support CN > Would it be possible to turn on comfort noise generation in FS for the > side which cannot handle CN? > When on side does not support CN, FS simply won't forward CN RTP packets. Comfort noise generation into media channel in FS is possible with bridge_generate_comfort_noise=true added in r9543. More about on http://wiki.freeswitch.org/wiki/VAD_and_CNG > 5. Is it possible to let FS detect silence and on one leg send CN > packets insted of RTP? > E.g. softphone->FS->GW (sends CN packets) > the softphone does not support CN, but for saving bandwidth it would be > good to have silence detection and in case of silence FS lets send CN > instead of RTP. > Yes, possible. VAD has to be turned on that channel and both sides have to agree on CN RTP packets (in SDP). > Sorry for my dump questions, I would like to understand the whole picture. > I hope I'm on the right way :) > I would like to add the clarification to FS wiki to lets other have less > troubles (with endpoints on one side supporting VAD/CNG and endpoints on > other side not supporting VAD/CNG, e.g. CallWeaver) > Check http://wiki.freeswitch.org/wiki/VAD_and_CNG > Thanks in advance! > > Regards, > Tamas > Tamas _______________________________________________ Freeswitch-users mailing list [email protected] http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org _______________________________________________ Freeswitch-users mailing list [email protected] http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org
