Add link to Mobile Control Point description

Author: rcdun

articles/communications-gateway/interoperability.md

@@ -51,7 +51,7 @@ Your core mobile network must supply this information to Azure Communications Ga
 
 Your core mobile network must also be able to anchor and divert calls into the Microsoft Phone System. You can choose from the following options.
 
-- Deploying Metaswitch Mobile Control Point (MCP). MCP is an IMS Application Server that queries the Teams Phone Mobile Consultation API to determine whether the call involves a Teams Phone Mobile Subscriber. MCP then adds X-MS-FMC headers and updates the signaling to divert the call into the Microsoft Phone System through Azure Communications Gateway.
+- Deploying Metaswitch Mobile Control Point (MCP). MCP is an IMS Application Server that queries the Teams Phone Mobile Consultation API to determine whether the call involves a Teams Phone Mobile Subscriber. MCP then adds X-MS-FMC headers and updates the signaling to divert the call into the Microsoft Phone System through Azure Communications Gateway. For more information, see the [Metaswitch description of Mobile Control Point](https://www.metaswitch.com/products/mobile-control-point).
 - Using other routing capabilities in your core network to detect Teams Phone Mobile subscribers and route INVITEs to or from these subscribers into the Microsoft Phone System through Azure Communications Gateway.
 
 > [!IMPORTANT]