For some of these noise problems, it is good to do a jitter analysis. I found it to be the cause of the problems I was having with my Cisco phone and a X-Lite client. Also, I found that the X-Pro client is better at voice delivery than the X-Lite client.
Anyway, if you have tcpdump available on your asterisk server, use it to collect some timing statistics. For example, tcpdump -i eth0 -T rtp dst host x.x.x.x and dst port 8000 (if I have this wrong, 'man tcpdump' will help you with the various options). Should decode the rtp stream on eth0 to port 8000 on x-lite. Pipe the output to a file. Should look like: 14:44:43.618422 10.1.1.60.8000 > sip.oneunified.net.15958: udp/rtp 160 c0 4208 758720 14:44:43.619033 10.1.1.60.8000 > sip.oneunified.net.15958: udp/rtp 160 c0 4209 758880 14:44:43.665234 10.1.1.60.8000 > sip.oneunified.net.15958: udp/rtp 160 c0 4210 759040 14:44:43.665521 10.1.1.60.8000 > sip.oneunified.net.15958: udp/rtp 160 c0 4211 759200 14:44:43.665925 10.1.1.60.8000 > sip.oneunified.net.15958: udp/rtp 160 c0 4212 759360 This sample doesn't correspond to the command line shown, but gives you an idea. http://www.erg.abdn.ac.uk/users/alastair/tcpdump.html has some descriptive comments about what you see. Anyway, now import the file into a spreadsheet. Do deltas between the times (first entry on each line, I usually discard the 14:44: stuff and focus on the nn.nnnnn portion) on each line (line 2 - line 1, line 3 - line 2, ... ). Make an x-y chart with the numbers in the second last column, 4208, ..., as x and the deltas as y. You may find some interesting results in terms of packet delivery timing. Excellent packet delivery occurs with a max jitter of 20 to 40 ms. Cisco phones have a dynamic jitter buffer up to 150 ms. My problem before was that an X-Lite softphone on a slow machine or on a really bad internet connection was averaging jitter between 80 and 200 ms. It was giving my phone a really hard time. Hence the pops and periods of multi second silence. This may not be at all useful for your problem, I just used it as an excuse to update people on my problems. ;-) Ray Burkholder [EMAIL PROTECTED] http://www.oneunified.net 704 576 5101 > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of > Jason A. Pattie > Sent: November 3, 2003 16:49 > To: [EMAIL PROTECTED] > Subject: Re: [Asterisk-Users] XTEN-Lite Bad sound! > > > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > WipeOut wrote: > | Has the bad quality started just recently? Has it ever > worked nicely for > | you?? > > It depends. :) > > | If either of these is "yes".. > | > | What has changed in your setup? Have you recently upgraded > to a newer > | CVS?? > > I have a fairly recent version of Asterisk, but X-Lite has > always worked > like a charm when accessing the PBX functions directly (i.e., leaving > voicemail, listening to menus, checking voicemail, etc.). However, > whenever I receive or make a call through the X100P card, the > people on > the other end say that I am "garbled" and the audio is very choppy and > "echo"y. I also notice an "on again", "off again" kind of > "beating" in > the audio stream whenever I am making a call. There is a period of > exactly 4 beats that seem to be more or less the same volume, very low > and in the background, that span approximately less than a 2 second > period. Then there is a period of silence for less than 2 > seconds, and > then the cycle is repeated. > > | I don't have an answer for you but at least it may stop > others falling > | into the same problem if somthing can be identified as the cause.. > | > | later.. > > Thanks. > > - -- > Jason A. Pattie > [EMAIL PROTECTED] > Xperience, Inc. (http://www.xperienceinc.com) > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.2.3 (GNU/Linux) > Comment: Using GnuPG with Debian - http://enigmail.mozdev.org > > iD8DBQE/ps0uuYsUrHkpYtARAkHwAJ4+aVbqZ4cxepsagqYFJC789E6AWACfY53o > DmehCt4pF+PvJO2RR+qcN88= > =5N/n > -----END PGP SIGNATURE----- > > > -- > This message has been scanned for viruses and > dangerous content by MailScanner, and is > believed to be clean. > MailScanner thanks transtec Computers for their support. > > _______________________________________________ > Asterisk-Users mailing list > [EMAIL PROTECTED] > http://lists.digium.com/mailman/listinfo/asterisk-users > > -- > Scanned for viruses and dangerous content at > http://www.oneunified.net and is believed to be clean. > -- Scanned for viruses and dangerous content at http://www.oneunified.net and is believed to be clean. _______________________________________________ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users
