[Freeswitch-users] Voice lag in conference

[Josh Moon]

I am not as knowledgeable as the developers that will respond to your question but I had the same problem as you.  Here is what I did to combat the delay:

First off I started everything from scratch.  I reinstalled Linux and then I reinstalled FreeSWITCH by creating .deb packages.
I then created my own conference profile and set the sample rate to 4000 and changed the energy level to 20.
I also made sure to test the conference room from phones that were in completely different areas so there wasn't a chance for feedback or really bad echoing problems.

Once I knew the delay was solved I raised the sample rate to 8000.  I tested it to make sure it would work properly.

As Michael stated, this could be your network infrastructure but I just wanted to let another FreeSWITCH user know what I did to try and stop the voice delay.

From: freeswitch-users-bounces at lists.freeswitch.org [mailto:freeswitch-users-bounces at lists.freeswitch.org] On Behalf Of Bradley Brashier
Sent: Tuesday, June 16, 2009 1:52 PM
To: freeswitch-users at lists.freeswitch.org
Subject: [Freeswitch-users] Voice lag in conference

I'm creating a conferencing product for use in a system with theoretically several hundred concurrent calls. I'm using FreeSwitch to create this product, but am not only new to FreeSwitch, but also the entire telecom industry as well as Open Source projects in general (I'm a recovering BIOS guy).

I've got a bare-bones conference up and running on the server, including a handshake and a couple of features, and am using the default packages from the current trunk, but I've noticed that voice lag is a pretty big issue. Common lag times are several hundred milliseconds, and I've heard as long as a second. It seems to be at least marginally specific to individual phones -- certain phones have longer lag than others even on the same call.

My question is really about what my options are. Is this just a part of SIP? Of conferencing? Of FreeSwitch? Are there things I can prune or slim down that will help? Is this a common issue? If it's common, is it expected by the marketplace?

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