1- i have two sites connected via wan which use a call manager express on each site configured individually (decentralized).
Can i deploy a redundancy if one of the cme router fail down to support the local site or some ip phones (if yes , how?) ...?
if wan fail calls between sites will move via the pstn.........
2- Regarding the above situation if i want to move to a centralized management using the CUCM...
what will happen to the ip phones licenses in both sites that already i pay for...........?
As there are three licenses- one for the router , one for the ip phones , and the last one for the interaction between the ip phones and the cme.
Which will i can reuse and which i will lose(money paid)?