How to create multiple phone numbers and forward them to mobile?

Question

Telephony

Task: Make a lot of phone numbers, separate for each sales channel, in order to track where the client came from. For example: Outdoor advertising, tel: 001, Vkontakte advertising, tel: 002, On business cards: 003
Question: How are these numbers created?
It is necessary that all calls flow to 2-3 numbers (mobile). For example: A person calls 001 (we fix that he is from outdoor advertising). Manager1, manager2, and manager3's phones are ringing. Whoever took it first, that and the percentage
A person calls from a business card: 003 for a specific person. The phone rings only at the manager1

Answer 1

Isn't it easier to forward call-tracking through the gsm-gateway to crm?