This is quite possible in CME here are some docs that explain the methods;
Speed-Dial Buttons and Abbreviated Dialing
In a Cisco CME system, each phone can have up to 33 local speed-dial numbers (codes 1 through 33), up to 99 systemwide speed-dial numbers (codes 1 through 99), or a combination of the two. If you program both a local and a systemwide speed-dial number with the same code (tag number), the local number takes precedence. In most cases you will want to reserve codes 1 through 33 for local, per-phone speed-dial numbers and use codes 34 through 99 for systemwide speed-dial numbers so that there is no conflict.
On an IP phone, a speed-dial number can be on a speed-dial button or it can be an abbreviated code that is dialed from the keypad. On an analog phone, a speed-dial number can only be an abbreviated code.
Each speed-dial definition contains a speed-dial code (an identifier also known as a tag) and usually the full extension or telephone number that should be dialed when the code is used at the phone. However, local speed-dial entries on IP phone buttons can be defined without telephone numbers so that phone users can enter whatever numbers they want from the phone. Local speed-dial definitions can also be created with locked numbers that cannot be changed from the phone. Systemwide speed-dial definitions cannot be changed from the phone.
IntroductionCUCM Routing RulesDial String implementation PolicyCUCM Routing LogicSIP URI Call Routing Analysis+++ Case Study: 1 ++++++ Case Study: 2 +++Conclusion
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