[Asterisk-Users] Voice Quality bad on one side of Frame Relay

[Michael Graves]

On Tue, 04 Oct 2005 14:28:47 +0800, Stephen wrote:

>Hi ,
>
>Does anyone encounter this problem ? We have installed Asterisk at Site 
>A and have 128k Frame Relay over to Site B.
>We are using Zyxel 2 port FXS at Site B and Linksys PAP2-NA at Site A. 
>We are using Ulaw at Site A and G729 at Site B.
>
>When the calls are originated from Site A to Site B, party at Site A can 
>hear Site B voice clearly and no breaking up voice. But Site B user 
>hears Site A voice is breaking up sometimes. The Total bandwidth usage 
>is about 30k.
>
>We have deployed the same setup to another Site , Site C with 64k Frame 
>Relay. Same things happen.

It sounds like you're very bandwidth constrained. A ULAW leg is going
to be 64k, or actually around 80k with IP overhead. Not sure abour FR
overhead. I can't see how you'll get anythin at site C without using a
compressed codec.

G729 is a good choice for codec to get over the bandwidth issue. Why
not use it in all cases? You can always experiment with GSM for no
cost.

Also, is there any other network activity beyond the voip streams? In
such a bandwidth limited instalation QoS management is going to be
critical.

Michael

--
Michael Graves                           mgraves at pixelpower.com
Sr. Product Specialist                          www.pixelpower.com
Pixel Power Inc.                                 mgraves at mstvp.com

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