Hi Pete,
Just to add a note to Gonz's good info (as always Gonz!) You can use MLA and just give the Regional Admins specific access like the Functional Group (Standard Phone) to reset phones etc;
Multilevel Administration
Multilevel Administration (MLA) provides multiple levels of security to Cisco Unified CallManager Administration. This technique permits granting only the required privileges for a selected group of users and limits the configuration functions that users in a particular user group can perform.
Prior to the availability of MLA, administrators with read/write access to Cisco Unified CallManager configuration could change any or all the database/directory elements that are accessible through Cisco Unified CallManager Administration and Cisco Unified CallManager Serviceability. Users could inadvertently disable the entire system with a few mouse clicks by accidentally modifying the data to which they do not need access.
Standard Functional Groups
Cisco Unified CallManager MLA creates standard functional groups. The following functional groups comprise the standard functional groups:
Standard Plugin
Standard User Privilege Management
Standard User Management
Standard Feature
Standard System
Standard Service Management
Standard Service
Standard Serviceability
Standard Gateway
Standard RoutePlan
**Standard Phone
From this good MLA doc;
http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_administration_guide_chapter09186a008070e448.html#wp1025046
Hope this helps!
Rob
