[Asterisk-Users] fxo connection in the UK

[Tim Robinson]

Peter
 From your description below it does not sound like it is a roaring success!

Type approval does not mean that it works. It just means it has been 
cursorily tested and doesn't appear to mess up the phone network.

You should find that if you just use TDM cards like the X100p and the 
adtran you should not get any perceptable echo.  As soon as you start 
using voip at the same time as an X100p you are asking for trouble. Echo 
will give you loads of complaints (more than crackles noise or volume as 
it is so intrusive in a call to hear your own voice coming back at you.)
The wrong number issue on the analogue cards was an issue I also had and 
was to do with post dial delays etc. I gave up fairly early on and went 
over to ISDN.

Again, ISDN will get you over the approval hurdle as the ISDN cards all 
have pan-european approvals, and solve the echo problems and resolve the 
wrong number issues etc.

Not that I wish to steer you in any particular direction ;-)

Rgds
Tim


Peter Hoppe wrote:
> I have used a x100P card in the test system, and it has performed 
> *reasonably* well with some echo.
>  I bought it from telappliant, so I guess it's approved for a UK 
> context. If it is the most practical solution I stick with three x100P 
> cards.
> 
> In the test system I had some trouble when I used a handytone286 adapter 
> with an Audioline503 economy telephone (No other phone did ring on 
> incoming calls; sometimes dialled wrong number when I used BT analog 
> line; audio sounds 'rough' and 'too bright'). Connection was fine with a 
> grandstream IP phone (BT-100).
> 
> UK approval is a make-or-break issue for me, as I would not like to 
> connect unapproved devices to a public network. The other solution I had 
> a look at was an adit600 channel bank with an 8-way fxo card and fxs 
> cards - but I dropped that option for the fxo side because the CAC fxo 
> module seems not to be approved for UK use either. Many thanks for all 
> your comments so far!
> 
> Peter
> 
> 
>> On Tuesday 30 November 2004 13:05, Edward Eastman wrote:
>>
>>> Most people get echo issues with x100p's in the UK due to mismatched
>>> impedance, the newer TDM400P is much better, and you could get this 
>>> with 3
>>> FXO modules (otherwise known as a TDM03B I believe).
>>>
>> The TDM fxo modules aren't approved for use in the UK yet - use at 
>> your own risk.
>>
>> Jon
> 
> 
>