Thread: CharlieCards v.v. Oyster (and Octopus?)
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Old April 4th 12, 09:14 AM posted to uk.railway,uk.transport.london,misc.transport.rail.americas
Adam H. Kerman Adam H. Kerman is offline
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Default Telephone line numbers, prefixes, and area codes
Stephen Sprunk wrote:
On 03-Apr-12 14:49, Adam H. Kerman wrote:
Stephen Sprunk wrote:

PBX trunks aren't numbered.

If outbound trunks aren't numbered, how does ANI work?

For a trunk, both called and calling number are explicitly signaled at
the start of each call in either direction.

So they are numbered.

Inbound calls to a number (or set of numbers, eg. DID) are routed to any
available trunk in the trunk group.

Right. ANI must be passed along to the PBX so it knows what extension
to connect to.
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