What an advantage of using of the SIP OAuth mode in Cisco Jabber?

Refer to the exhibit. This INVITE is sent to an endpoint that only supports G.729. What must be done for this call to succeed?
A financial Webex Calling Org wants to block spam and fraudulent calls and only present calls from verified callers to their employees Which parameter in the SIP P-Asserted-identity header from the terminating service provider is used to determine a fraudster call?
A company wants to provide remote user with access to its premises Cisco collaboration features. Which components are required to enable cisco mobile and remote access for the users?