As Paul mentioned. You would want to consume the least amount of bandwidth per call over your choked up DSL link, while on the LAN you want to use the better quality G711 CODEC.
The way Cisco does it is, group extensions that are on the same LAN together in a logical group and then specify that all extensions within this group use alaw, while communication between this group and other groups (supposedly over the WAN) use G729. The point here is, by grouping extensions together you can specify which CODED(s) could be used Intra-group and which ones could be used Inter-group. This way give admins much needed flexibility. By using the group concept you can also configure many other parameters that only relates to intra-group conversations. cheers -----Original Message----- From: M. Ranganathan [mailto:[email protected]] Sent: Saturday, 1 August 2009 7:42 a.m. To: Yakout Esmat Cc: [email protected] Subject: Re: [sipx-users] CODEC scenario On Fri, Jul 31, 2009 at 3:16 PM, Yakout Esmat<[email protected]> wrote: > Hi, > > > > We all know that sipX doesn't transcode and it doesn't need to which is > great but in saying that can we set up a scenario like this one: > > > > A sipX 4.0 server and a couple of Aastra phones on the LAN (Aastra phones > are capable of doing G711 and G729 ) > > > > Can we set these up in a way that forces the phones to use alaw (g711) > between each other over the LAN and use G729 over the SIP trunk (SIP trunk > over DSL) to provider? No you cannot do that. May I ask you why you want to do that? We used to have codec filtering in sipxbridge but it is an ugly hack and does not exist any longer for good reason. Codecs are negotiated end to end in sipx. Ranga > > > > Thanks > > > > _______________________________________________ > sipx-users mailing list [email protected] > List Archive: http://list.sipfoundry.org/archive/sipx-users > Unsubscribe: http://list.sipfoundry.org/mailman/listinfo/sipx-users > sipXecs IP PBX -- http://www.sipfoundry.org/ > -- M. Ranganathan _______________________________________________ sipx-users mailing list [email protected] List Archive: http://list.sipfoundry.org/archive/sipx-users Unsubscribe: http://list.sipfoundry.org/mailman/listinfo/sipx-users sipXecs IP PBX -- http://www.sipfoundry.org/
