I suspect that IAX has less overhead but when we get into voice bandwidth then the answer gets very complex for any given codec. Andrew mentions SIP concurrency but I doubt that this "buys" very much. In reality, in a single processor world everything gets processes serially. For *2* IAX would be my choice every time, but for IP phones 95% are SIP so it's academic as to which protocol is best (as you have no choice). The only way I see of changing this is to manufacture IPphones with both protocols in firmware but that would only be possible if the demand for IAX devices increased. Its a bit like the VHS vs Beta war, both systems have their good and bad points In the end, sales/marketing perception will always win regardless of better technologies.
Henry L.Coleman CEO *VoIP-PBX* 1-866-415-5355 Toronto Ontario Canada > On Thu, 2006-10-26 at 13:14 -0400, Henry.L.Coleman wrote: >> As I understand it the main advantege IAX has over SIP is the number of >> port it uses and therefore its ability to traverse router/switches and >> firewalls >> Also the higher number of simulatanious SIP calls travelling through >> these >> devices adds a higher overhead than IAX with it's single port. >> Personally I like IAX but I there simply isnt enough hardware out there >> to >> use it exclusively. >> > > What about the bandwidth used for both protocols? Is IAX using less or > more bandwidth than SIP? > > > >> Henry L.Coleman CEO >> *VoIP-PBX* 1-866-415-5355 >> Toronto Ontario >> Canada >> >> >> >> -----Original Message----- >> >> From: Dave Cotton [mailto:[EMAIL PROTECTED] >> >> Sent: Thursday, October 26, 2006 10:21 AM >> >> To: Asterisk Users Mailing List - Non-Commercial Discussion >> >> Subject: Re: [asterisk-users] SIP v IAX2 >> >> >> >> >> >> On Thu, 2006-10-26 at 17:43 +0200, Pavel Jezek wrote: >> >> > with SIP qualify, I can specify, what time in delay I will accept, >> >> > with sip and setting qualify=3000 I can circumvent this >> >> anoying messages >> >> > (bacause delay in reply is about 2000ms, and I accept 3000ms) >> >> > with iax, qualify is working different, so setting >> >> qualify=3000 will >> >> > "ping" peer every 3s, >> >> > quite inconsistent, imho >> >> >> >> So are you saying that in your world two different things, created by >> >> totally different people, must have the same configuration settings. >> > >> > - You will find DUNDi configuration a lot easier with IAX, although >> you >> > can use SIP. >> > - If you use SIP to route calls between Asterisk boxes, you will lose >> your >> > caller id as SIP uses the From: number to authenitcate with. You will >> have >> > to store the original caller id in an extra SIP header, and then pluck >> it >> > out an the other end, if you want to preserve caller id. Yuck. IAX >> doesn't >> > have this problem. >> > >> > Doug. >> > >> > _______________________________________________ >> > --Bandwidth and Colocation provided by Easynews.com -- >> > >> > asterisk-users mailing list >> > To UNSUBSCRIBE or update options visit: >> > http://lists.digium.com/mailman/listinfo/asterisk-users >> > >> > >> >> _______________________________________________ >> --Bandwidth and Colocation provided by Easynews.com -- >> >> asterisk-users mailing list >> To UNSUBSCRIBE or update options visit: >> http://lists.digium.com/mailman/listinfo/asterisk-users > -- > Guillermo Salas M. > Telconet S.A. > Calle 15 y Avenida 24 Esq > Edificio Barre #2 Primer Piso > Telefono : +593 5 262 8071 > Celular : +593 9 985 5138 > e-mail : [EMAIL PROTECTED] > www : http://www.manta.telconet.net > http://www.telcocarrier.net > > Linux User: 255902 > > Beat me, whip me, make me use Windows! > > Please avoid sending me Word or PowerPoint attachments. > See http://www.fsf.org/philosophy/no-word-attachments.html > > Please avoid the Top Posting, see > http://es.wikipedia.org/wiki/Top-posting > > _______________________________________________ > --Bandwidth and Colocation provided by Easynews.com -- > > asterisk-users mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users > > _______________________________________________ --Bandwidth and Colocation provided by Easynews.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
