In business telephony, issued numbers have nothing to do with outbound transit. You just have a bundle of circuits/capacity that signal source and destination n

In business telephony, issued numbers have nothing to do with outbound transit. You just have a bundle of circuits/capacity that signal source and destination numbers on a per call basis, inbound and outbound. There’s no requirement that the caller ID you send is one of the numbers routed to your trunk by that provider. A branch office could accept calls only through an extension on the enterprise VoIP network, while still placing outbound calls on a local provider and sending the main headquarters number as caller ID.