We are ready to begin using Zoho Voice with CRM integration for both voice and SMS.

I understand the basics of the 10DLC registration process. 

The use case is that each of my sales reps needs to interact with their customers via SMS and be distinguishable as themselves...ie a single, shared phone number for SMS won't satisfy.

What needs to happen to issue a per-user phone number for SMS?  

What do I need to know and do to support this use case?