How to destroy a lot of phone numbers (sim cards)?

Question

Telephony

There are many direct city numbers, they change at the store to track the advertising channel.
There are several managers, each with a box of mobile phones, there are a lot of mobile phones and it is inconvenient.
Forwarding to one phone is not an option, because you need to keep track of the number they are calling and the number of the caller.
With an asterisk to understand and drive all incoming through modems - the only option or are there alternatives?

Answer 1

Well, either take a software atska from the operator, in my opinion all opsos give this, or an asterisk or any other software or hardware telephone router.

Answer 2

Beeline seems to have SIP, the same as Megaphone's Multiphone. I use the latter through asterisk. If the beeline is the same. That I recommend.