Pre-Requisites
- Access to the CUCM Cluster
Purpose
- Block a number from calling into the Call Manager system
Creating an Inbound Call Block List – Step by Step
- Determine which SIP Trunk / Gateway the inbound call comes in on normally
- Write down the Calling Search Space used for Inbound Calls (ex: Internal Only)
- This will be configured on the Gateway or Trunk page (whatever device the calls come in on)

- Create the following Partitions (Call Routing > Class of Control > Partition)
- Inbound Calls
- Filter List
- Create the following Calling Search Spaces (Call Routing > Class of Control > Calling Search Space)
- Gateways
- To_Filter_List


- Create the following Translation Patterns with the “Inbound Calls” partition
- Note: The ##XXXX and [^1-9][^1-9]XXXX patterns are for the UCCX CTI ports. We have to add these as our CTI ports begin at directory number ##7900
- Ensure that the “Route Next Hop by Calling Party Number” checkbox is checked
- Ensure that the Calling Search Space is “To_Filter_List”
- If you do not have UCCX, you only need the blank and ! translation patterns


- Create the following Translation Patterns with the “Filter List” partition
- Ensure the Calling Search Space is set to the normal CSS from Step 1 (Internal Only in this example)
- All three translation patterns are needed


- Create the following Translation Pattern in the “Filter List Partition”
- This is the pattern that will block the numbers
- Ensure that the “Route Option” is set as “Block This Pattern” and “Call Rejected”
- NOTE: You can simply copy this pattern each time you need to block a new number
- NOTE: If calls come in with a +1, you may need to add that on this translation pattern in order to match the incoming number


- Apply the newly created “Gateways” Calling Search Space to the SIP Trunk or Gateway
- Perform a “Reset” on the gateway or SIP Trunk
- NOTE: This is service impacting and will drop calls. Perform this after hours.
- Place an inbound call after a few moments and verify inbound calls are still working
- Block your own number as described in step 6c
- Place an inbound call and verify it is rejected