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

[Ryan Ratliff (rratliff)]

If your provider is acting as a SIP registrar you will certainly need a CUBE, and to be honest I'd recommend it anyway just so you don't have to allow UCM and phones direct connectivity outside your network.  

http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/srnd/collab10/collab10/trunks.html#pgfId-1363704

> When connecting to a service provider's IP PSTN network, Cisco strongly recommends the use of the Cisco Unified Border Element as an enterprise edge Session Border Controller to provide a controlled demarcation and security point between your enterprise and the service provider's network. 

-Ryan

On Aug 12, 2014, at 7:41 PM, Robert Blayzor <rblayzor.bulk at inoc.net> wrote:

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



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