Learn the correct steps to configure called party transform mask in Cisco Unified Communications Manager (UCM) when adding a second PSTN provider, without impacting existing PSTN connections. Ensure the called party information matches the new provider’s requirements at the route list level.
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Question
An engineer configures Cisco UCM to use a second PSTN provider and ensures that the called party information that is sent matches what the provider expects. However, the engineer already configured the gateway, created the route group, and added the route group to the existing route list. Which action ensures the called party information requirement without affecting the existing PSTN provider?
A. Add a called party transform mask to the route list detail for the new PSTN route group.
B. Add a called party transform mask to the route pattern.
C. Add an external phone number mask to all devices.
D. Add a calling party transform mask to the route pattern.
Answer
A. Add a called party transform mask to the route list detail for the new PSTN route group.
Explanation
This is the correct answer. When you have multiple PSTN providers with different called party information requirements, you should apply the called party transform mask at the route list level for the specific route group associated with the new PSTN provider.
Here’s why:
- The route list allows you to specify different called party transform masks for each route group, enabling you to accommodate varying requirements of multiple PSTN providers.
- By applying the transform mask at the route list level, you ensure that the called party information is modified only for calls routed through the new PSTN provider’s route group.
- This approach avoids impacting the existing PSTN provider’s configuration, as the transform mask is not applied globally or at the route pattern level.
The other options are incorrect because:
B. Adding the transform mask to the route pattern would apply the mask to all calls matching that pattern, potentially affecting the existing PSTN provider.
C. Adding an external phone number mask to all devices is not a targeted solution and would impact all calls, not just those to the new PSTN provider.
D. Adding a calling party transform mask to the route pattern would modify the caller’s information, not the called party information required by the new PSTN provider.
In summary, when integrating a new PSTN provider with specific called party information requirements into your Cisco UCM environment, the best practice is to apply a called party transform mask at the route list level for the route group associated with the new provider. This ensures a targeted implementation without affecting existing PSTN connections.
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