Thanks for the suggestion. Changing the RTP Packet Size in the Sipura to 40ms did improve the call quality "slightly", but still well below par compared to the Cisco 7960.
In my ethereal captures, I did notice something interesting. While the RTP stream from the Cisco to asterisk seemed to have a 160 diffference in timestamps, the Sipura showed a 320 difference: Cisco: RTP Payload type=ITU-T G.729, SSRC=1794532067, Seq=57094, Time=40666896 RTP Payload type=ITU-T G.729, SSRC=1794532067, Seq=57095, Time=40667056 Sipura: RTP Payload type=ITU-T G.729, SSRC=3045937487, Seq=7784, Time=434932771 RTP Payload type=ITU-T G.729, SSRC=3045937487, Seq=7784, Time=434933091 On Tue, 15 Feb 2005 18:43:39 -0700, Keith Burns <[EMAIL PROTECTED]> wrote: > What is your sample size? > > I believe the 7960 supports 40ms (2 samples) per packet by default. > > Do you have an ethereal trace? Look at the timestamps between RTP packets if > you can't see/modify this setting. > > > > -----Original Message----- > > From: [EMAIL PROTECTED] [mailto:asterisk-users- > > [EMAIL PROTECTED] On Behalf Of Pedro > > Sent: Tuesday, February 15, 2005 6:30 PM > > To: Jeffrey Chan > > Cc: Asterisk Users Mailing List - Non-Commercial Discussion > > Subject: Re: [Asterisk-Users] Sipura g729 call quality to PSTN > > > > Actually the SPA-2100 supports 2 g729 channels which is why I bought > > it. Unfortunately, the call quality is just as poor on the 2100 as it > > is on the 2000. > > > > - Pedro > > > > > > On Tue, 15 Feb 2005 23:12:51 +0000, Jeffrey Chan <[EMAIL PROTECTED]> > > wrote: > > > Is it just a bad implementation of g729 compression with the Sipura > > > > > > product line? > > > > > > > > > > > > > > That would be my guess too . why SPA-2000 supports G729 for one > > > channel only? no enough CPU power to code/decode G.729 for two > > > channels? > > > > > > Jeffey > > > > > > www.mutualphone.com > > > > > > > > > On Tue, 15 Feb 2005 16:31:59 -0500, Pedro <[EMAIL PROTECTED]> > wrote: > > > > uggg. > > > > > > > > Is anyone out there having any luck with the SPA-2000 or SPA-2100 > > > > using the g729 codec with decent call quality? > > > > > > > > > > > > On Tue, 15 Feb 2005 10:19:05 -0500, Mark Eissler <[EMAIL PROTECTED]> > wrote: > > > > > > > > > > On Feb 14, 2005, at 1:25 PM, Pedro wrote: > > > > > > > > > > > > > > > > > Is it just a bad implementation of g729 compression with the > Sipura > > > > > > product line? > > > > > > > > > > > > > > > > That would be my guess. > > > > > > > > > > -mark > > > > > > > > > > -- > > > > > Mark Eissler, [EMAIL PROTECTED] > > > > > Mixtur Interactive, Inc. [EMAIL PROTECTED] http://www.mixtur.com > > > > > > > > > > > > > > _______________________________________________ > > > > Asterisk-Users mailing list > > > > Asterisk-Users@lists.digium.com > > > > 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 > > Asterisk-Users@lists.digium.com > > 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 Asterisk-Users@lists.digium.com http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
