[asterisk-users] Fwd: Patton smartnode 463x (BRI) 25ms tail echo cancellation

[Gaëtan Minet]

Thanks !

We installed it in the interim and have a lot of calls with far-end  
echo :(.
But it seems the solution could be to reduce the TX gain on our side  
(these are using polycom phones, and  indeed  I can see a big  
amplitude  imbalance between tx/rx on a recording). It's under test, I  
hope it'll solve it.

Kind regards,

Gaetan


On 09/09/2009, at 16:22, Jorge Mendoza wrote:

> Gaëtan,
>
> They are using as gateway to the pstn. In fact, they are remote  
> gateways
> for a centralized callcenter:
>
> [pstn] «--» [BRI] «--» [internet] «--» [callcenter]
>
> Regards
>
> Jorge Mendoza
>
> Gaëtan Minet wrote:
>> Thanks
>>
>> Are you using these to connect isdn phones to the voip or to as a
>> gateway to the pstn for a voip system ?
>>
>> Kind regards
>>
>> Gaetan
>>
>>
>> On 08/09/2009, at 19:40, Jorge Mendoza wrote:
>>
>>
>>> We have some installations with smartnode 4554, (same tail echo
>>> cancellation) without problems so far.
>>>
>>> Jorge Mendoza
>>>
>>> Gaëtan Minet wrote:
>>>
>>>> Hi
>>>>
>>>> Is anybody using these ?
>>>>
>>>> Gaetan
>>>>
>>>>
>>>> Begin forwarded message:
>>>>
>>>>
>>>>> *From: *Gaëtan Minet <gminet-ml at mcit.be <mailto:gminet- 
>>>>> ml at mcit.be>>
>>>>> *Date: *Sat 22 Aug 2009 16:29:42 GMT+02:00
>>>>> *To: *Asterisk Users Mailing List - Non-Commercial Discussion
>>>>> <asterisk-users at lists.digium.com
>>>>> <mailto:asterisk-users at lists.digium.com>>
>>>>> *Subject: **[asterisk-users] Patton smartnode 463x (BRI) 25ms tail
>>>>> echo cancellation*
>>>>> *Reply-To: *Asterisk Users Mailing List - Non-Commercial  
>>>>> Discussion
>>>>> <asterisk-users at lists.digium.com
>>>>> <mailto:asterisk-users at lists.digium.com>>
>>>>>
>>>>> Hi all
>>>>>
>>>>> We use pci/pci-e BRI cards in our installations. Due to echo
>>>>> problems
>>>>> (that was before Oslec and others), we quickly switched to cards
>>>>> with
>>>>> hardware-based EC.
>>>>> So we use exclusively Digium B410p cards that provide 64ms tail  
>>>>> EC.
>>>>>
>>>>> For several reasons we'd like to switch to external BRI gateways
>>>>> like
>>>>> the Patton smartnodes (the price is getting really close to a
>>>>> B410p).
>>>>>
>>>>> I'm however curious about their HW EC. I see in the datasheets
>>>>> that it
>>>>> only has 25ms tail per channel (pri are 128ms, but not BRI).
>>>>> Are some of you using these gateway and do your experience (many)
>>>>> echo problems on calls ?
>>>>>
>>>>> Our other alternative is to use sangoma cards that have 128ms HW  
>>>>> EC
>>>>> and seem more stable overall, but it is yet a bit more expensive.
>>>>>
>>>>> Thanks for your feedback.
>>>>>
>>>>> Regards,
>>>>> Gaetan
>>>>>
>>>>>
>>>>>
>