Which direction are you wanting to block caller id?
You can block outbound caller id from an ip phone. It can be blocked globally or on a case by case basis.
To enable caller id manipulation, in your outbound route patterns, you need to check, "Use Calling Party's External Phone Number Mask".
1) If you want to block caller id globally, then in the route pattern, in the called party transform mask enter in something, you can use a dummy number, a single digit, or a # or *.
2) If you want to block called id on a per phone basis, then leave the called party transform mask in the route pattern blank, and in the phone config for your phone. Enter something in the External Phone number mask field for each line on the phone. You can use a dummy number, a single digit, or a # or *. Personally I use a * to block caller id.
IntroductionCUCM Routing RulesDial String implementation PolicyCUCM Routing LogicSIP URI Call Routing Analysis+++ Case Study: 1 ++++++ Case Study: 2 +++Conclusion
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