This article describes the steps necessary to configure to block collect incoming R2 calls. At the time this article was written, Brazil is the only country using this methodology for blocking collect calls.
Collect call blocking uses the R2 _Calling Party Category- to accomplish the block. For an incoming R2 call to the , the switch sends a called number and a Calling Party Category (CPC) of II-8. To accomplish the block, the must reject the called number that was received. Therefore, in advance, the is configured to reject certain number(s), and does so with a specific cause code. Instead of responding with a B-4 for call rejection, the responds with a B-7 to indicate collect call blocking.
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Verify the following:
This section assumes that the user is familiar with basic R2 call setup and routing in the .
The configuration process comprises four major actions:
Define, using regular expressions, the called number(s) that receives collect calls on. In the following example, any four digit number beginning with 8 (e.g., 8888) is matched to the regular expression defined in the Input Value Field (this number will be rejected by ). The Input and Output Fields have the same value.
To create and configure the transformation:
Define an action configuration which, if matched, acts as defined. In this case, the action configuration releases the call with a cause code of 1: Unallocated Number. This cause code MUST be defined.
To create the action configuration:
Create an action set and define an entry to that action set which ties the transformation number(s) to the action configuration. Using this action set, if the receives any of the numbers defined in the transformation table above, it rejects the call with the cause code of 1: Unallocated Number.
To create the action set and add the entry:
Assign the above action set in the incoming R2 Signaling Group definition for Action Set Table. This procedure assumes that the signaling group and the CAS signaling profile have already been created and configured. This procedure only adds the Action set to this predefined signaling group.
To add the action set to the signaling group: