Which version of Local Gateway software interworks with Webex Calling?

The correct response highlights that IOS-XE 16.9(4) is the version of Local Gateway software recognized for interworking with Webex Calling. This specific version has been validated for compatibility, which means it has the necessary features and enhancements to effectively support Webex Calling functionalities.

When using a Local Gateway with Webex Calling, it is crucial to have a version that not only supports the features required by Webex but also any specific configurations that optimize performance and stability. IOS-XE 16.9(4) includes improvements in call processing and integration capabilities that ensure reliable performance when connected to Webex services. This makes it a preferred choice for organizations utilizing Webex Calling alongside existing on-premises infrastructure.

In the context of the other versions mentioned, while they might have their own sets of features, they have not been documented as compatible with Webex Calling to the same extent as version 16.9(4), which establishes the latter as the clear choice.