CUCM 6.1.2 with Unity 7.0 license for MAX-PORTS. CUCM will only allow the creation of upto 144 ports but the Unity license allows upto 200.
Can more that 144 ports be created on CUCM?
I don't believe the increased Unity Port support is available in any CUCM 6.1(2) release. CUCM 6.1(3) and 7.1(2)support up to 999 ports.
You are probably hitting this bug that can be remedied by upgrading CUCM;
CSCsx23764 Bug Details
CUCM increase voicemail port limit- ccmadmin
Unity version 7.x supports up to 200 ports registered to a single CUCM cluster for each Unity server. Using the Voicemail Port Wizard in CUCM 5.x, 6.x, 7.x you are unable to add more than 144 ports with the wizard.
Relevant to Unity 7.x where more than 144 ports are configurable with one Unity server. Need to change parameter in CUCM from a drop-down list to a variable field that will account for future changes in Unity that may allow more VM ports to be added.
Manually add Unity ports in CUCM configuration Status
4 - minor
In Last 2 weeks
Cisco Unified Communications Manager (CallManager)
Hope this helps!