We have this from time to time. It's usually someone using a cheap headset
that's turned up too high. Polycom's have some settings you can tweak to
cancel out the echo, although they're not supported. We used them for a
short while, but they seemed to interfere with the echo can on our Sangoma
card, so we had to set them back to default.
You might want to see if Aastra phones offer some type of internal echo can,
if there are cheap headsets being used (the person not hearing the echo
should turn his/her volume down), or if there's one phone in particular
causing problems (could be a bad network cable or NIC on the phone).
On 1/23/07, Carlos Chavez <cursor@telecomabmex.com>
wrote:>
> I have a customer running Asterisk 1.2.13, Zaptel 1.2.11 with a
> TE110P,
> a TDM04B and an Astribank-32. They have been complaining that there is
> echo on calls even when they are IP to IP on the same network. There
> are 18 Aastra 9133i phones and 30 analog phones connected to the
> Astribank. I can understand there being a bit of echo on the analog
> phones, but I do not understand why there would be echo on the SIP
> phones when they are all using ALAW/ULAW and are on the same local
> network. I even have QoS configured on the Linksys SRW224P switch to
> give priority to the voice services.
>
> --
> Telecomunicaciones Abiertas de Mexico S.A. de C.V.
> Carlos Ch?vez Prats
> Director de Tecnolog?a
> +52-55-91169161 ext 2001
>
>
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