[Asterisk-Users] Fun with Echo

[Brian Swan]

Hi Steve,

Thanks for the email. These are 3 pots lines terminated on a  
TDM4xxP.  The remote ends are analog lines, and they all "sound  
great".  The echo is experienced on the near end.  Also, calls  
between phones inside the network all sound great as well, so I don't  
think it's our phones.

Thanks!
Brian

On Jun 9, 2006, at 11:22 AM, Steve Davies wrote:

> On 6/9/06, Brian Swan <swannie at swannie.net> wrote:
>> Actually, that's what I started out with, and outboud calls were the
>> same as now, inbound calls had a huge amount of echo (until I turned
>> on Aggressive).  In my testing I actually didn't notice any
>> difference between KB1 actually worked better then MG2....  thanks
>> for the advice, though!
>>
>> Brian
>
> What equipment is being used?... Phones, ISDN/analogue lines, adapter
> cards etc. Perhaps people have some specific experience of the
> equipment you are using.
>
> The asterisk echo-canceller does not echo cancel on behalf of the
> remote party, only for the local user (the user on the asterisk side
> of zaptel), so if the remote party is hearing echo, it may be caused
> by failings in the local infrastructure - e.g. Cheap sh*t plastic SIP
> phones are a common cause, where there is a huge echo path through the
> cheapo handset (a decent phone will cancel this, or simply not cause
> it)
>
> Another cause of echo I have found is cheap european E1 service
> providers who route calls through foreign countries as a LCR measure,
> but do not use echo cancelling (which should almost always be done by
> the telco on an international call leg) - This may also apply to
> inter-state call legs in the USA.
>
> Regards,
> Steve
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