G.729 is just about everywhere. A lot of boxes use G.723 (and/or G.726) too but G.729 ends up with about the same quality but at a much lower bit rate. Most inexpensive "hard" phones don't use G.723 because it takes a lot of CPU power. G.729 gets better results in the same or less CPU. We always try to use phones supporting G.729, anything else is just gravy. If you can use reinvites then you have no need for the G.729 unless you use the IVR, MOH, etc. features of * where it is dishing out audio. Even then you have to consider if its worth it... After all if you are starting hosted VM company using * then the G.729 is a must, but if you are just using to route calls between 2 phones that can reinvite then the codec capabilities of * don't matter.
---------------------------------------- Michael Shuler, C.E.O. BitWise Systems, Inc. 1301 W. Pioneer Parkway Peoria, IL 61615 Office: (217) 585-0357 Cell: (309) 657-6365 Fax: (309) 213-3500 E-Mail: [EMAIL PROTECTED] Customer Service: (877) 976-0711 > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of > Carlos Chavez > Sent: Monday, March 08, 2004 11:11 PM > To: [EMAIL PROTECTED] > Subject: Re: [Asterisk-Users] Most common CODEC > > > On Mon, 8 Mar 2004 23:45:44 -0500, Andrew Kohlsmith wrote > > > G.729 is the best codec IMHO. Goto > > > http://www.packetizer.com/iptel/bandcalc.html to get the > real scoop. > > > > IMO ILBC beats G.729 in terms of quality, especially in > environments > > where packet loss can occur. It's about the same computationally- > > speaking but it's also royalty-free. > > > > GSM is my second choice but it eats quite a bit more bandwidth in > > comparsion. > > > > That packetizer link has no comparisons with any OSS codecs, which > > is unfortunate because it seems to pass itself off as an > > authoritative source on bandwidth use in IP telephony. > > > > I am not trying to start a codec war or find out which > is the best > protocol. What I need to know is when I buy a Grandstream > phone, a Cisco > phone, a Sippura adaptor or any other hard phone, what codec > is usually > supported by all of them. All of them obviously support > G.711 but that is not > the best for use when connecting through the Internet. Is it > worthwhile to > buy G.729 licenses for Asterisk, or is there another codec > that is wildly > supported buy most phones? > > -- > Carlos Chavez > Computer Engineer, CCNA > Corporativo Lacer S.A. de C.V. > > _______________________________________________ > Asterisk-Users mailing list > [EMAIL PROTECTED] > http://lists.digium.com/mailman/listinfo/asterisk-users > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users > _______________________________________________ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
