Anyone got any tips on improving sound quality on soft phones running under Window XP SP2? I have tried Xlite, SJPhone and Firefly. They all seem to have significant sound quality problems. We have a reasonable sized network of several hundred devices connected together using Layer 2 switches, i.e. pretty dumb switches with no QoS. I also have a Grandstream connected to the same switching gear. The Grandstream sounds pretty good with very few drop outs or sound problems on ulaw. The soft phones all have problems although they get less when going to a lower bandwidth codec, but then lower bandwidth gives you worse sound quality too. Is there any way I can improve sound quality on the softphones? Or it is pretty well the general rule that they have poor sound quality? It makes sense to install a softphone on each of the 200 desktops we have but not to buy 200 Grandstreams or equivalent, and not to upgrade all our network switches. On the Asterisk side, jitter buffer is turned on with default settings. TOS is turned on for SIP although I doubt the switches can do anything with it. I have played around with a lot of Asterisk settings but without getting good results.
I have a client that experienced quality problems and he said the resolution turned out to be the QoS option for the nic card (even though their backbone didn't support QoS). Try the softphones with and without QoS to hear the difference. ------------------------> Anyone got any tips on improving sound quality on soft phones running > under Window XP SP2? > I have tried Xlite, SJPhone and Firefly. > They all seem to have significant sound quality problems. We have a > reasonable sized network of several hundred devices connected together > using Layer 2 switches, i.e. pretty dumb switches with no QoS. > I also have a Grandstream connected to the same switching gear. > > The Grandstream sounds pretty good with very few drop outs or sound > problems on ulaw. > The soft phones all have problems although they get less when going to a > lower bandwidth codec, but then lower bandwidth gives you worse sound > quality too. > > Is there any way I can improve sound quality on the softphones? > Or it is pretty well the general rule that they have poor sound quality? > > It makes sense to install a softphone on each of the 200 desktops we > have but not to buy 200 Grandstreams or equivalent, and not to upgrade > all our network switches. > > On the Asterisk side, jitter buffer is turned on with default settings. > TOS is turned on for SIP although I doubt the switches can do anything > with it. > I have played around with a lot of Asterisk settings but without getting > good results. > > > _______________________________________________ > 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---------------End of Original Message-----------------
I've tried setting the QoS settings on the card and using the Microsoft QoS packet scheduler, in all combinations, but no changes. I don't think these applications use QoS anyway. -----Original Message----- From: asterisk-users-bounces@lists.digium.com [mailto:asterisk-users-bounces@lists.digium.com] On Behalf Of Rich Adamson Sent: Friday, January 28, 2005 11:07 AM To: Asterisk Users Mailing List - Non-Commercial Discussion Subject: Re: [Asterisk-Users] Soft phone sound quality help I have a client that experienced quality problems and he said the resolution turned out to be the QoS option for the nic card (even though their backbone didn't support QoS). Try the softphones with and without QoS to hear the difference.