Which step is required when configuring Cisco Webex Hybrid Message Service?

Refer to the exhibit.

An ISDN gateway is registered to Expressway-C with a prefix of 9 and/or it has a neighbor zone specified that routes calls starting with a 9.
Which value should be entered into the "Source" field to prevent toll fraud regardless at origin of the call?

In a Mobile and Remote Access deployment, where must communications be encrypted with TLS?

What is configured on the Expressway-E to successfully route calls from Expressway-C on the internal network to the Internet?

Refer to the exhibit.

Which description of the transformation is true?