Our company has a single UC520-48U, and we foresee the need for expansion to about 120 ports. We use DID, so is there any way to implement multiple UC520s and transfer and route calls between the UC520s? I've seen a tunneling solution that claims to support that, but it requires the use of separate subnets, which won't work. Anything that will?
The company has already rejected getting a bigger Cisco device - it's either build on the UC520 or go to another mfg solution.