Dave, for telephony BT for a site your size it would be hideously expensive.
Can you give me an idea of:
How many extensions
Whether there are PCs at each site
Whether each site has an internet connection
Do you use such things as hunt groups (One number rings multiple handsets)
For a small business with multiple sites with an internet connection I would be inclined to install something like Office communications Server from Microsoft. VoIP interbranch - via the internet - so calls are free.
Telephony gateway which bridges from PSTN to OCS for outgoing calls.
Mind you there may even be cheaper options with things like Asterisk.
What kind of budget were you thinking for this Dave? You could probably do this for 10k ish including h/w I would have thought.
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