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London Transport (uk.transport.london) Discussion of all forms of transport in London. |
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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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