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

[Greg Oliver]

We have all Cisco - and they are pricey, but work great otherwise.  Both
with chsn_sccp and SIP.  05 -> 70s and a few 20s

-Greg

On Sat, 2005-10-01 at 14:47 +0100, Angus Comber wrote:
> 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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