Hello Arthur,

On Aug 19 04:38 in a msg to Ian Smith, Arthur Marsh of 3:800/812 wrote:

 IS> You keep mentioning the S12s, but what about AXE?  There are 
 IS> a hell of a lot of these, up this way anyway, some of which 
 IS> have only recently been deployed, or repositioned to replace 
 IS> older ARE and even some extant crossbar gear.

 AM> Calls from those exchanges still need echo-cancellation when there
 AM> is about 8 milliseconds or more of round trip delay. I don't have
 AM> any idea on where echo-cancellers are placed for such calls, unless
 AM> it's in the transit exchanges. 

I guess what Ian is probably wondering (and so am I) is if there are no
S12s at either end, perhaps there is no easy way to implement 2100Hz tone
detection for billing purposes. I guess it will also depend where billing
is generated if it's not from the local exchange.

Cheers,
Poe

--- timEd/2 1.10+