> I have previously had good success on smaller installations with TDM400P
> cards.  I now have a UK customer looking for 8-10+ lines and it seems
> like a PRI would be most economical + reliable?

Best bet would be to talk to <insert telco of preference> and ask them what 
they recommend. For anything more than about 8 channels a PRI is likely to be 
the most cost-effective route if you need physical lines on-site, especially if 
that's likely to grow beyond 8 lines in the future.

However, I should mention that most of our recent (larger) installs have 
involved a single BRI on-site (for emergency calls, etc.) but routing nearly 
all other calls out via SIP/IAX to an upstream wholesale provider. Likewise, 
said wholesaler also provides standard geographic numbers.

You've obviously had better success with the TDM400Ps than I have in the UK. 
Certainly the call quality on asterisk installs we've done around 
Northampton/Milton Keynes has improved markedly since we switched to delivering 
calls via SIP or IAX rather than using physical lines on-site. The clients are 
also happy - each less line they have on-site is a saving of at least £10/month.

(if you want to discuss wholesale providers, that's probably not something for 
this non-commercial list - email me directly if you like)

Hope that helps.

Regards,

Chris
-- 
C.M. Bagnall, Director, Minotaur I.T. Limited
For full contact details visit http://www.minotaur.it/chris.html
This email is made from 100% recycled electrons


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