Question 1

Which SIP media encryption mode is applied by default for newly created zones in the Cisco Expressway?

Options :

A : Off

B : Best Effort

C : Auto

D : Force Encrypted

Answer: A

Question 2

Which protocol should be used to verify the connectivity for different media paths found during a call using ICE?

Options :

A : STUN

B : RTP

C : SNMP

D : TURN

Answer: A

Question 3

What allows endpoints behind a NAT to discover the paths through which they will pass media?

Options :

A : RTP

B : TLS

C : SNMP

D : ICE

Answer: D

Question 4

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Refer to the exhibit. An Expressway-C and Expressway-E are configured for B2B calling and the

Expressway-E zone is set to TLS Verify Currently, calls do not reach the Expressway-C. The Traversal

Client zone on the Expressway-C for B2B reports the information in the exhibit for the Peer 1 address.

Which action resolves this error?

Options :

A :

Configure the Expressway-C Traversal Client zone Peer 1 address with the fully qualified domain name

of the Expressway-E.

B : Configure the Expressway-C Traversal Client zone transport protocol with TCP.

C : Add a server certificate to the Expressway-C that is signed by a certificate authority.

D : Add an intermediate certificate to the Expressway-C that is signed by a certificate authority.

Answer: D

Question 5

Which two internal SIP endpoints behind a firewall place calls to external devices? (Choose two.)

Options :

A : An Expressway-C communicates with the internal endpoint and forwards the media to and from an Expressway-E.

B : A Cisco Endpoint is configured with a publicly routable static NAT SIP address to advertise instead of is private IP address.

C : An Expressway-C communicates directly with the remote party using the ICE protocol

D : An Expressway-E is used as a VPN server to allow remote SIP edge servers to connect calls

E : An Expressway-C rewrites the SIP SDP to advertise its own IP address to the external party.

Answer: A,D