[cisco-voip] CUCM 9+ and SIP trunk provider w/o CUBE

[Robert Blayzor]

I am planning on replacing an again CallManager deployment with SCCP phones with a new CUCM 10.x and SIP phones.

Our service provider can provide all of our trunking and PSTN connectivity via a direct SIP trunk, so I no longer need a PSTN gateway or PRI card, etc.  (or at least I should not).

We will be peering SIP from the CUCM to our providers SBC, so the question begs to ask on our side is a CUBE absolutely required to make this work?  Pros/Cons?  I'd rather not have to add a CUBE in if I don't have to.

Since the phones are native SIP as is the CallManager I'm trying to understand why a CUBE is required? (or is it not?)

TIA

-Robert