[cisco-voip] Determining if a DID block is available?

[Norton, Mike]

>> A block of 50 DIDs is pretty tiny. For such a small amount, I would probably begin my search by just calling a few random numbers from the 50 and see where the call ends up.
> 
> That doesn't prove anything, because it could be already on someone else's PRI, just not in use, and you won't necessarily get an error tone on it.

If somebody answers the phone, then that pretty obviously shows that the number is in use. Why would you consider that to be not proving anything? I said it would be a good way to *begin* the search, not a foolproof way of getting a definitive answer every time.

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Mike Norton
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