I know the Zyxel 2000 Wireless phones to be bad with G729 (the default) and WEP enabled.

Usually, asterisk will sit in the media stream. As the G729 codec needs licensing asterisk would have rejected it and defaulted to G711 a-law (probably).

As ser does not sit in the media stream, probably the phones tried to use g729 as they just directly connected the media streams.

Also, inherently the sound quality will not be as good from an 8kbps codec as a 64kbps codec...

Hope this has some pointers,

Dave

-----Original Message----- From: serusers-bounces@iptel.org [mailto:serusers-bounces@lists.iptel.org] On Behalf Of Daniel-Constantin Mierla Sent: 21 October 2004 11:25 To: Joao Pereira Cc: serusers Subject: Re: [Serusers] faster SER

There is nothing to improve in SER as long the communication was established. In the case a NAT would be involved you would need either a RTP relay (rtpproxy, media proxy) or in some cases just a STUN server (depending on SIP clients and NAT type).

On 10/21/04 12:15, Joao Pereira wrote:

No, there was no NAT involved, both phones were in the same LAN. With bad comunication I mean bad audio (with eco) and with lots of moments with no audio at all.

Try to force the SIP clients to use some other audio codec (if they support more than one) -- maybe one has a broken implementation of the codec chosen for communication.

And in the same LAN and in the same conditions, but with Asterisk, the comunication was perfect.

I do not know much about asterisk, it may do some media correction or codecs translation.

Daniel

Is there any configuration changes that I can make to inprove SER?

Joao

----- Original Message ----- From: "Daniel-Constantin Mierla" Daniel-Constantin.Mierla@fokus.fraunhofer.de To: "Joao Pereira" joao.pereira@fccn.pt Cc: serusers@lists.iptel.org Sent: Thursday, October 21, 2004 11:04 AM Subject: Re: [Serusers] faster SER

what you mean by communication was bad? The audio quality? The signaling?

SER doesn't deal with audio stream at all, just with the signaling part. Is there any NAT involved?

Daniel

On 10/21/04 11:54, Joao Pereira wrote:

...

Hi I tried two SIP Phones Zyxel Prestige 2000 W with SER and the comunication was very bad, even in a second test with SIP software client and a Zyxel phone, the comunication wasnt good, then I tried the same phones and software with the Asterisk server and the comunication was perfect, can I configure SER to have a better performance in the comunication? Does anyone experienced a problem like this?

João Pereira

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