Remove reference to Azure Communications Gateway, as it is now deprecated.

Author: aspreadbury

articles/communication-services/concepts/telephony/certified-session-border-controllers.md

@@ -32,7 +32,6 @@ If you have any questions about the SBC certification program for Communication
 
 |Vendor|Product|Software version|
 |:--- |:--- |:--- 
-|[Microsoft](https://azure.microsoft.com/products/communications-gateway/)|Azure Communications Gateway|2023-01-31|
 |[AudioCodes](https://www.audiocodes.com/media/lbjfezwn/mediant-sbc-with-microsoft-azure-communication-services.pdf)|Mediant Virtual Edition SBC|7.40A|
 ||Mediant 500 SBC|7.40A|
 ||Mediant 800 SBC|7.40A|