Home » Forums » Community Edition » Help

Audio quality when multiple calls go out

danielmanis
Posts: 18
 Member Since:
2008-02-19
Submitted by danielmanis on Wed, 08/13/2008 - 6:17am.

We have a customer using an older distro of trixbox CE, Asterisk 1.2.23, having call quality issues. They have data and voice separate on the network and on the circuit, with a voice T1. On the phones, inside the network, they experience no issues, but the called party sometimes hears garbled audio. Not every call and not throughout the entire call.

In some initial testing it appeared that the quality was effected when another call was initiated outbound from another user on the system. We had Cbeyond test all of their equipment and lines and they saw no errors.

With 3 active calls SWAP is at 0%, MEM is at 71%.

Any suggestions?

‹ How to make changes to the Meet-Me template Transfer call to automated extension ›

&nbsp

stechnique
Posts: 733
 Member Since:
2008-02-21
What about CPU usage? Is the
Wed, 08/13/2008 - 6:23am

What about CPU usage?
Is the server doing any transcoding?


&nbsp

danielmanis
Posts: 18
 Member Since:
2008-02-19
CPU stays low, not over 10%,
Wed, 08/13/2008 - 7:01am

CPU stays low, not over 10%, and when it gets that high it seems to be because of op_server.pl.

We are using Aastra 9133i's, in the Global SIP Settings page we do not have Basic Codecs (u-law/a-law) enabled. Should we? In sip.conf we have disallow=all, allow=ulaw, allow=alaw.


&nbsp

stechnique
Posts: 733
 Member Since:
2008-02-21
Place a phone call and type
Wed, 08/13/2008 - 7:47am

Place a phone call and type "sip show channels" from the Asterisk CLI. Make sure the internal (phone to PBX) channel uses the same codec as the external (PBX to cbeyond) channel.
With 10% CPU usage though I don't think that's the problem, but if you can avoid some transcoding you might as well check it out.


&nbsp

danielmanis
Posts: 18
 Member Since:
2008-02-19
The output of sip show
Wed, 08/13/2008 - 8:07am

The output of sip show channels says ulaw, is that the internal or external codec? And do you know how to set the codec the Aastra phone uses?


&nbsp

danielmanis
Posts: 18
 Member Since:
2008-02-19
Any other ideas?
Mon, 08/18/2008 - 10:58am

Any other ideas?


&nbsp

danielmanis
Posts: 18
 Member Since:
2008-02-19
Any other ideas?
Mon, 08/25/2008 - 12:19pm

Any other ideas?


&nbsp

danielmanis
Posts: 18
 Member Since:
2008-02-19
codecs
Mon, 08/25/2008 - 12:47pm

In the Aastra phones we have Basic Codecs disabled, Force RFC2833 enabled, and no custom codecs specified. Where does the phone get the codec to use from?


&nbsp

Comment viewing options

Select your preferred way to display the comments and click "Save settings" to activate your changes.