I am wanting to understand the concept of IP Communicator working from home over a VPN registering with on-site CallManager.
Customer reports that when the register their IPC on their company laptop at home. The IP phone registers but when a call is originated, set up, but no RTP is passed.
The concept will be along the lines of the layer 2 MAC registering on the CallManager will be the PC's MAC and not as traditionally I.E hard phones MAC.
I understand the UDP ports assigned for RTP.
What I am wanting to fully understand is what needs to be built on the customer network to facilitate this - I can appreciate customer firewalls etc but what would be the base requirements if we consider the voice and data sit on different VLAN's.
Any guidance to further clarify would be most appreciated...