[Asterisk-Users] strange wave like noise on sip handset

[Angus Comber]

No it happens on our asterisk and at a customers.  Not that noticeable but 
not crystal clear.  Didn't happen on a Snom 190.

I have been working my way through IP handsets with these results:

Grandstream BT-100 series.  OKish for the price but a bit echoy.

Grandstream GXP-2000 - OK but if used on hands free a bit echoy.

Snom 190.  Very clear.  However, on a customer site they complained that 
full volume was still not load enough. But didn't extensively test.

Sipura SPA-841 - when receiving an incoming call echoy for about 2-3 seconds 
at start of call then echo went away.  Remote end did not hear any echo. 
Also wave like hiss as per my message.

Next phones to try are a Polycom 300 and a CISCO 7940.

I suppose it depends on how demanding customer is.  I would hope that I can 
find a phone with no echo / hiss /other problems.  Perhaps I need to think 
about using channel banks/FXS cards and analog phones!  But would prefer IP 
phones for flexibility etc.

Anyone found a perfect IP phone?

Angus


----- Original Message ----- 
From: "Leif Madsen" <asterisk.leif.madsen at gmail.com>
To: "Asterisk Users Mailing List - Non-Commercial Discussion" 
<asterisk-users at lists.digium.com>
Sent: Saturday, October 01, 2005 2:33 PM
Subject: Re: [Asterisk-Users] strange wave like noise on sip handset


On 9/30/05, Angus Comber <angus at iteloffice.com> wrote:
> On a Sipura SPA-841 handset (and also at other end) you hear a sea wave 
> like
> sound - it gets louder then softer and continually repeats.
>
> I don't remember hearing this when using other handsets.  But what is this
> effect?  How can I reduce it?

I heard the same thing from a remote users Polycom 501 - seems it was
sitting too close to a fan in a computer. Could it be something
similar to that?

Just a thought since this happened to me yesterday :)

--
Leif Madsen - http://www.leifmadsen.com
Astricon 2005, Anaheim, CA, October 12-14
http://www.astricon.net
http://www.oreilly.com/catalog/asterisk
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