Folks! We have purchased G729 and have been testing the codec on mUltiple Gateways. Here is what we have found. Here is the config I have used: ------------------------------- Asterisk Server On Dual Pentium Xeons with 6GB of RAM, running on Fedora Core 2 User1 is in USA on Broadband Cable User2 is in India on 64Kbps ISDN Line User1 using SIPURA SPA 2000 user2 using Xten professsional(X-pro) that has g711, g723 and GSM Test Conducted as below: ------------------------ User1=SIPURA(Codec set as g729 ) --> Asterisk( converts g729 to GSM ) --> User2=Xten/Xpro(GSM ) Conversion at Asterisk: ---------------------- user1 to user2 - From g729 to GSM user2 to user1 - From GSM to g729 Results: ------- 1) User1 Can hear the User2's voice at a quality level of 6 out of 10 2) User 1 can hear User2's Voice as muffled noise rather than clear voice 3) User2 can hear User1's voice at a quality level of 3-4 out of ten 4) User2 can hear User1's voice as noisy craclkle with a lot of ticking Conclusions: -------------- 1)Codec g729 does not help in the connectivity between two users using GSM at one end. 2)Xten does not have support for G729 and hence is not the right choice for connectivity to Asterisk. Recommendation: -------------- 1)Asterisk community should work on passthrough connectivity for g723(Currently it does not work, though I read that it is there) I will post results of tests with our own Brand of SIP Phone "eezeephone *Ship" in the next post. Seshu Kanuri eezeePhone.com
Kanuri, Seshu wrote:> Conclusions: > -------------- > 1)Codec g729 does not help in the connectivity > between two users using GSM at one end. > 2)Xten does not have support for G729 and > hence is not the right choice for connectivity > to Asterisk.ILBC is your friend. Many softphones support it and more and more hardphones support it, too. If your end user gear supports ILBC, then the reasons to use G.729 or GSM are not all too compelling. We've been making phone calls from Egypt to Japan with a 33.6K dialup modem on what has got to be one of the world's most mediocre telephone lines (getting roughly 20K out of it - but very unstable). ILBC and IAX2 was the only thing that worked - nothing else would - and it was virtually indistinguishable from a PSTN call. rgds benjk -- Sunrise Telephone Systems Ltd 9F Shibuya Daikyo Bldg., 1-13-5 Shibuya, Shibuya-ku, Tokyo, Japan __________________________________________________ GANBARE! NIPPON! Yahoo! JAPAN?JOC OFFICIAL INTERNET PORTAL SITE http://mail.ganbare-nippon.yahoo.co.jp/
Benj, This is a good tip and we will try it out tonight to see how that works. I will keep the forum posted. By the way the tests with Azatel Box at one end in canada and SIPURA at the other end with me were great( offcourse why wouldn't they be) Thanks once again. Seshu Kanuri -----Original Message----- From: asterisk-users-admin@lists.digium.com [mailto:asterisk-users-admin@lists.digium.com]On Behalf Of Sunrise Ltd Sent: Tuesday, July 27, 2004 2:26 PM To: astusr Subject: Re: [Asterisk-Users] g729 + GSM + g723 Kanuri, Seshu wrote:> Conclusions: > -------------- > 1)Codec g729 does not help in the connectivity > between two users using GSM at one end. > 2)Xten does not have support for G729 and > hence is not the right choice for connectivity > to Asterisk.ILBC is your friend. Many softphones support it and more and more hardphones support it, too. If your end user gear supports ILBC, then the reasons to use G.729 or GSM are not all too compelling. We've been making phone calls from Egypt to Japan with a 33.6K dialup modem on what has got to be one of the world's most mediocre telephone lines (getting roughly 20K out of it - but very unstable). ILBC and IAX2 was the only thing that worked - nothing else would - and it was virtually indistinguishable from a PSTN call. rgds benjk -- Sunrise Telephone Systems Ltd 9F Shibuya Daikyo Bldg., 1-13-5 Shibuya, Shibuya-ku, Tokyo, Japan __________________________________________________ GANBARE! NIPPON! Yahoo! JAPAN?JOC OFFICIAL INTERNET PORTAL SITE http://mail.ganbare-nippon.yahoo.co.jp/ _______________________________________________ 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