[asterisk-users] SIP to IAX to SIP Jitterbuffer question
Question: If I am IAX trunking between 2 Asterisk instances, and ultimately connecting to SIP endpoints on BOTH ends of the call, can I let the ENDPOINTS do ALL the jitterbuffering, or must the iax-trunk do its own jitterbuffering? I'm asking because I'm ignorant to the nuanced MECHANICS of the transport: That is to say, if asterisk is passively sending voice frames from one protocol the other, then it clearly WOULD NOT matter if they go through the asterisk instance out-of-order. The endpoint's local jitterbuffer can re-order the frames/packets. Therefore in that scenario, it would seem that one could effectively eliminate the IAX jitterbuffer entirely and slightly decrease latency. On the OTHER hand if the voice frames are being 'repackaged' by asterisk on new time bounaries, then naturally iax would need to do ALL of its own jitterbuffering to prevent incremental losses from out-of-order packets. As I write this, it occurs to me that there may be a third option in which IT DOESN'T MATTER because there will be little or no out-of-order delivery within the local ethernet broadcast domain (to which each sip endpoint is connected), AND THEREFORE the IAX de-jittering would effectively cause the AUTOMATIC jitterbuffer on the endpoints to 'dry up' appropriately to near zero. Could someon critique my logic or speak to this question? Thanks! -Karl -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] SIP to IAX to SIP
On Mon, 2009-10-19 at 08:02 -0500, asterisk-users-requ...@lists.digium.com wrote: George Farris wrote: >> I have a machine running Ubuntu that I run Asterisk 1.4.x on and it runs >> very well. On that machine I have a SIP phone. I have configured a >> netgear wgt634u with asterisk and a SIP phone and linked the two systems >> together via IAX. Audio from Ubuntu to netgear is not bad, audio from >> netgear to ubuntu is unintelligible. Any clues as to whether this will >> work? Configuration suggestions? Is a 200MHz arm processor just too >> small? >what codec are you using? I'm pretty sure it is GSM. Cheers George ___ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- AstriCon 2009 - October 13 - 15 Phoenix, Arizona Register Now: http://www.astricon.net asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] SIP to IAX to SIP
George Farris wrote: > I have a machine running Ubuntu that I run Asterisk 1.4.x on and it runs > very well. On that machine I have a SIP phone. I have configured a > netgear wgt634u with asterisk and a SIP phone and linked the two systems > together via IAX. Audio from Ubuntu to netgear is not bad, audio from > netgear to ubuntu is unintelligible. Any clues as to whether this will > work? Configuration suggestions? Is a 200MHz arm processor just too > small? what codec are you using? -- Iván Stepaniuk Alba Fotónica S. L. www.albafotonica.com ___ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- AstriCon 2009 - October 13 - 15 Phoenix, Arizona Register Now: http://www.astricon.net asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
[asterisk-users] SIP to IAX to SIP
Hi all, I have a machine running Ubuntu that I run Asterisk 1.4.x on and it runs very well. On that machine I have a SIP phone. I have configured a netgear wgt634u with asterisk and a SIP phone and linked the two systems together via IAX. Audio from Ubuntu to netgear is not bad, audio from netgear to ubuntu is unintelligible. Any clues as to whether this will work? Configuration suggestions? Is a 200MHz arm processor just too small? Any help appreciated. sip phone <--> wgt634u <- iax -> ubuntu <--> sip phone wireless 200MHz arm 3GHz AMDhardwired 100MB 100MB lan between systems Hope this is clear enough. Cheers George ___ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- AstriCon 2009 - October 13 - 15 Phoenix, Arizona Register Now: http://www.astricon.net asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
