CUCM 7.X – Rewrite Outbound CLI Presentation with Calling Party Transformation Masks

Problem :

You want your MGCP controlled E1/T1 to present a single outbound CLI for a group of DN’s that is different from their individual DID’s. You also want all other DN’s to present as normal.

  • You could hardset the Caller ID DN field on the E1 under “Call Routing Information – Outbound Calls” – This will overwrite all DN’s not just the ones you want
  • You could adjust the “External Phone Number Mask” on the DN. – This works but it will also change the phone display and can have AAR Implications
  • You could duplicate your dialplan in a seperate partition with new CSS’s and Route lists. Overwrite the CLI at the Route List – This is just yuck and doesn’t scale

Transformation Patterns to the Rescue! A Transformation Pattern will allow you to adjust the Calling Party number when it hits the gateway conditionally based on the original internal calling party number.

  • Create a Partition called CLIRewrite
  • Create a CSS called CLIRewrite that looks at Partition CLIRewrite
  • Configure your MGCP Gateway:
  1. Device > Gateway
  2. Select your Gateway
  3. Select your E1/T1 Interface
  4. Under “Call Routing Information – Outbound Calls Uncheck “Use Device Pool Calling Party Transformation CSS”
  5. Choose “CLIRewrite” in Calling Party Transformation CSS Combo Box
  • Create your Transformation Mask:
  1. Call Routing > Transformation Pattern > Calling Party Transformation Pattern
  2. Click Add New
  3. Under Pattern enter the internal DN you wish to rewrite (Pattern matches like 28XX also work for matching multiple DN’s)
  4. Under Calling Party Transformation Mask enter the full number you wish to present out your E1
  • Reset your MGCP gateway under Devices>Gateways
  • I also had to do a “no mgcp” and then “mgcp” on the gateway itself
  • Make a test call to your mobile phone to see the re-written number

24 thoughts on “CUCM 7.X – Rewrite Outbound CLI Presentation with Calling Party Transformation Masks

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  2. hey man..thanks for the tutorial. it works!! in my case, i don’t have to do “no mgcp mgcp”

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