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1 / 60

A company already has a Cisco Unified Communications Manager for internal audio and video traffic, but it requires video communication with external partners and customers. It is important to ensure security for the deployment and the connectivity.
What must be set up to enable this requirement?

Cisco Expressway-C and Cisco Expressway-E

Cisco Expressway-C and Cisco Unified Border Element

Cisco Unified Border Element and Cisco Firepower Firewall

Cisco Unified Border Element and Cisco ASA Firewall

2 / 60

When an Expressway-E is configured for static NAT, which Session Description Protocol attribute is modified to reflect the NAT address?

SDP c-line

SDP m-line

SIP record route

SDP b-line

3 / 60

A company is installing Cisco Collaboration infrastructure and one of the requirements is that they must be able to communicate with many external parties that are using H.323 and SIP. Internally they want to register the endpoints only on SIP.
Which functionality would describe the feature that needs to be enabled and where to achieve this?

Interworking in Cisco Unified Communications Manager

Transcoding in Expressway-C

Transcoding in Cisco Unified Communications Manager

Interworking in Expressway-C

4 / 60

Which complication does a NAT introduce in SDP for a SIP call?

The IP address specified in the connection data field may be an unrouteable internal address

The encryption keys advertised in the SDP are only valid for clients not behind a NAT

When the client is behind a NAT they may be unable to determine the appropriate offset due to time zones

Additional headers due to NAT encapsulation can cause the packet size to exceed the MTU

5 / 60

Which media encryption mode can be configured on an Expressway zone?

Force unencrypted

Triple Data Encryption Standard

IPsec

Advanced Encryption Standard

6 / 60

What is a key configuration requirement for Hybrid Message Service High Availability deployment with multiple IM and Presence clusters?

AXL service should be activated only on the publisher of each IM and Presence cluster

Your IM and Presence Service clusters must have Multiple Device Messaging disabled

You must have the Intercluster Lookup Service working across all of your IM and Presence clusters

You must have the Intercluster Sync Agent working across your IM and Presence clusters

7 / 60

Cisco Collaboration endpoints are exchanging encrypted signaling messages.
What is one major complication in implementing NAT ALG for voice and video devices?

Source addresses cannot provide the destination addresses that remote endpoints should use for return packets

NAT ALG introduces jitter in the voice path

Internal endpoints cannot use addresses from the private address space

The NAT ALG cannot inspect the contents of encrypted signaling messages

8 / 60

What is the purpose of a transform in the Expressway server?

A transform changes an alias that matches certain criteria into another alias

A transform is used to route calls to a destination

A transform changes the audio codec when the call goes through the Expressway

A transform has the function as a neighbor zone in the Expressway. It creates a connection with another server

9 / 60

An organization with a domain name of example.com.
Which two SRV records are valid for a SIP and H.323 communication? (Choose two.)

_sips._tcp.example.com, _h323ls._udp.example com

_sips._udp.example.com, _h323ls._tcp.example.com

_h323ls._udp.example com, _collab-edge._tls.example.com

_h323ls._tcp.example.com, _sips._tcp.example.com

_collab-edge._tls.example.com, _sips._udp.example.com

10 / 60

H.323 endpoints can be configured in what two ways for registration with the Cisco Expressway?

Manual, Automatic

Mono, Dual

Automatic, Mono

Dual, Manual

11 / 60

The _____ is a logical group within the Local Zone that all endpoints register to by default.

Primary Zone

Secondary Subzone

Default Zone

Default Subzone

12 / 60

Cisco Expressway is often deployed in which of the following configurations?

As a pair with Cisco Expressway-C, with connection to CUCM and Expressway-E deployed in DMZ

Standalone with Cisco Expressway-C

Standalone with Cisco Expressway-E

As a pair with Cisco Expressway-E, with connection to CUCM and Expressway-C deployed in DMZ

13 / 60

A Pipe is a bandwidth restriction that is applied to what?

Traversal Zone

Zones

Subzones

Links

14 / 60

The collaboration administrator is getting the following error: No Voicemail Service “403 Forbidden”. What might be the cause?

The Cisco Unity Connection (CUC) hostname is not included on the HTTP server allow list

The Cisco Unity Connection (CUC) does not have a SIP trunk with Expressway

The Cisco Unity Connection (CUC) server/cluster is not online

The Cisco Unity Connection (CUC) has no user mailbox

15 / 60

To enable Hybrid Message Service, you must link Message Connector to your IM and Presence Service cluster by entering server information for which node?

Secondary

Primary

Subscriber

Publisher

16 / 60

How many SRV records would need to be created when both SIP and H.323 are being used?

Five

Three

Two

Four

17 / 60

Refer to the exhibit. While troubleshooting Cisco Jabber login issues, there are some error messages. Why is the Jabber client unable to sign in?

Service discovery issues

Incorrect login credentials

Down Cisco Unified Communications Manager server

XMPP bind failures

18 / 60

Jabber cannot log in via Mobile and Remote Access. You inspect Expressway - C logs and see this error message: XCP_JABBERD Detail="Unable to connect to host '%IP%', port 7400:(111) Connection refused" Which is the cause of this issue?

The XCP Service is not activated on Expressway - E

The destination port for Expressway - E is set to 7400 instead of 8443 on the Expressway - C

Rich Media Session licenses are not activated on Expressway - E

Expressway - E is listening on the wrong IP interface

19 / 60

When deploying an Expressway Core and Expressway Edge cluster for mobile and remote access, which TLS verify subject name must be configured on the Expressway - E UC traversal zone?

Expressway - C Cluster Name

Cisco Unified Communications Manager Publisher FQDN

Expressway - E Cluster Name

Webex CUSP Cluster Name

20 / 60

What it is the purpose of using ICE for Mobile and Remote Access endpoints in the Cisco Collaboration infrastructure?

ICE enablement allows for the Cisco Collaboration endpoint to register through Expressway servers to Cisco Unified Communications Manager behind a firewall

ICE uses FAST updates to optimize the video quality in case of packet loss. This technology is available only from Cisco Unified CM version 11.5 and later

ICE controls the bandwidth usage for Cisco Collaboration endpoints if the endpoints are located outside the company network

ICE enables Cisco Collaboration endpoints to determine if there is direct connectivity between them

21 / 60

What must be set up to enable this requirement?

Cisco Expressway-C and Cisco Expressway-Ecorrect

Cisco Expressway-C and Cisco Unified Border Element

Cisco Unified Border Element and Cisco Firepower Firewall

Cisco Unified Border Element and Cisco ASA Firewall

22 / 60

What is the Cisco-recommended key length in bits for a Cisco Expressway certificate?

4096

8192

2048

1024

23 / 60

Refer to the exhibit.

Which two numbers match the regular expression? (Choose two.)

d20d16d20d22, 209165200225

2091652010224, d209d165d200d224

209165200225, 209165200224

d209d165d200d224, d20d16d20d22

209165200224, 2091652010224

24 / 60

A company has enabled ICE to optimize call flows and improve video quality between their Cisco Collaboration endpoints internally and externally.

For which reason would you see activity on the TURN server when a call is established between two external endpoints?

The video call is using 4K resolution, which is not supported by ICE with CUCM 12.5

A STUN cannot punch holes in the firewall

ICE cannot reduce the packet loss on the link

The video call is using encryption, which is not supported by ICE with CUCM 12.5

25 / 60

Which role does Call Policy play when preventing toll fraud on Expressways?

It changes the audio codec used in a call through Expressways

It changes the audio protocol used by a call through Expressways

It changes the calling and called number on a call

It controls which calls are allowed, which calls are rejected, and which calls are redirected to a different destination

26 / 60

Which statement about scheduling Expressway backups is true?

It is allowed from the application CLI and GUI of the Expressway

It is allowed from the application GUI of the Expressway only

It is not supported on the application

It is allowed from the application CLI of the Expressway only

27 / 60

What happens to the encrypted signaling traffic of a collaboration device if you place it inside a firewall with private IP addresses and try to make a call over IP without any collaboration infrastructure?

Encrypted IP traffic for collaboration devices always is trusted by the firewall

The signaling makes it back to the endpoint because the endpoint sent the private address to the external endpoint

The signaling does not make it back to the endpoint because the firewall cannot inspect encrypted traffic

The signaling makes it back to the endpoint because the firewall is an application layer gateway and provides address translation

28 / 60

Between which two DTMF relay methods does the Expressway support interworking? (Choose two.)

Unsolicited notify, RFC 2833

RFC 2833, KPML

KPML, Passthrough

Passthrough, 245 user input indication

245 user input indication, Unsolicited notify

29 / 60

Which two types of information does Cisco Expressway back up? (Choose two.)

Call records, Current call states

log les, IP addresses

IP addresses, Security certificates

Current call states, log les

Security certificates, Call records

30 / 60

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

ICE

TLS

SNMP

RTP

31 / 60

Which connection does the traversal zone configuration de ne?

Cisco UC and Cisco Unified Presence Server

Cisco Expressway-C and Cisco Expressway-E platformscorrect

Cisco UCS E-Series and Cisco UCM

Expressway-E and Collaboration Endpoints

32 / 60

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

TURN

SNMP

RTP

STUN

33 / 60

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

Force Encrypted

Auto

Best Effort

Off

34 / 60

Cisco media traversal technology has enabled a secure environment where internal video endpoints call and receive calls from external video endpoints.

How does the Expressway-C and Expressway-E communicate?

Expressway-C, which is also in the DMZ, will receive and make calls on behalf of Expressway- E because they are in the same network

Internal endpoints are registered to Expressway-E in the DM

Expressway-E establishes an outgoing request to Expressway-C, enabling the Expressway-C in the DMZ to notify the internal Expressway-E of an incoming call from an external endpoint

Expressway-C establishes an outgoing request to Expressway-E, enabling the Expressway-E in the DMZ to notify the internal Expressway-C of an incoming call from an external endpoint

Expressway-E, which is also in the DMZ, will receive and make calls on behalf of Expressway- C because they are in the same network

35 / 60

Which dial plan component is configured in Expressway-C to route a call to the Cisco UCM?

Call policy

Traversal subzone

Call routing

Search rule

36 / 60

Which describes what could done on the Expressway-E to successfully route calls from Expressway-C on the internal network to the Internet?

The Expressway-E could be enabled for Dual-NIC capability

The Expressway-E could be enabled for interworking

A static NAT route could be added to the firewall to bridge the two networks

Application layer gateway could be enabled to bridge the media traffic

37 / 60

Which attribute in the SDP for a call is affected by the static NAT address configuration in an Expressway-E?

Version

Bandwidth

Connection

Name

38 / 60

Refer to the exhibit.

What is the result of a transformation applied to alias 88514?

[email protected]

88513@ccnpcollab com

39 / 60

When configuring a Cisco Expressway solution and need to design the dial plan with various rules for URIs and numbers coming through the device. To do so, it is important that some dial plan rules are applied in a certain order. When configuring the transform section, you must know the range of the priorities.

Which range is correct?

any number between 1-65534

any number between 1-128

any number in the dialog box

any number in the drop-down menu

40 / 60

Which zone is required on a B2B deployment between Expressway-C and Expressway-E?

Neighbor zone

Default zone

DNS zone

Traversal zone

41 / 60

Which mode should be used when Call Policy is configured on Expressways?

Remote CPL

Local CPL, policy service, and off

Extended CPL

42 / 60

When designing the call control on a Cisco Expressway Core, which is the sequence of dial plan functions?

Search rules, transformscorrect

DNS zone, local zone, search rules

Search rules, zones, local zones

Transforms, CPL, user policy, search rules

43 / 60

Refer to the exhibit.

When configuring a search rule that routes calls to a zone, what occurs when 13358 is dialed?

13358 is replaced by 135, and then is sent to the traversal zone

13358 is sent directly to the traversal zone

13358 is replaced by 135 and remains in the same zone

13358 is replaced by 135, and then is sent to the local zone

44 / 60

Which step is taken when configuring a Cisco Expressway solution?

Disable

Configure the Expressway-E by using a non-traversal server zone

323 mode on the Expressway-

Enable static NAT on the Expressway-E only

Enable

460.19 demultiplexing mode on the Expressway-

323

45 / 60

Refer to the exhibit.

Which description of the transformation is true?

It converts [email protected]:<port> to [email protected]

It changes [email protected]:<port> to [email protected]

It changes all patterns that begin with [email protected]:<port> to [email protected]

It converts [email protected]:<port> to [email protected]

46 / 60

Which step is required when configuring cloud and hybrid deployments for Cisco Jabber?

Add the Jabber user to Cisco Unity Connection

Add the Jabber user to Expressway

Add Jabber Users to the Cisco Webex Administration Tool

47 / 60

Refer to the exhibit.

In an environment SIP devices are registered to CUCM and H.323 devices to VCS.

What would be required to enable these calls to setup correctly?

Create a presearch transform

Change the interworking mode to On

Disable SIP in the external zone

Change the domain of SIP endpoint A to cisco.com

48 / 60

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" eld to prevent toll fraud regardless at origin of the call?

Traversal Zone

All

Neighbor Zone

Any

49 / 60

Refer to the exhibit.

Which inbound connection should an administrator configure on the outside firewall?

SIP: TCP 5061

HTTPS (tunneled over SSH between C and E): TCP 2222

Media: UDP 36000 to 36011

XMPP: TCP 5222

50 / 60

How does an administrator configure an Expressway to make sure an external caller cannot reach a specific internal address?

Configure FAC for the destination alias on the Expressway

Add a search rule route all calls to the Cisco UCM

Add the specific URI in the firewall section of the Expressway and block it

Block the call with a call policy rule in the Expressway-E

51 / 60

A call is sent by Cisco UCM to Expressway with a URI of [email protected].

If (7508`¦)@expc1a.pod8.test.lab.* is the pattern string, what would be the replacement string of the transform in Expressway to re-write the call so that it becomes [email protected]?

[email protected].@

[email protected]

[email protected].*

[email protected].!

52 / 60

An engineer wants to configure a zone on the Expressway-E to receive communications from the Expressway-C in order to allow inbound and outbound calls.

How is the peer address configured on the Expressway-C when Expressway-E has only one NIC enabled and is using static NAT mode?

Expressway-E FQDN

Cisco UCM FQDN

Expressway-E DHCP

Cisco UCM DHCP

53 / 60

Refer to the exhibit.

Mobile Cisco Jabber cannot register with on-premises Cisco Unified Communications Manager using Mobile and Remote Access. Some logs were captured on Expressway Edge.

Which action corrects this problem?

Ensure that the credential has been entered correctly

Ensure that the SIP domains are added on Expressway Core

Ensure that the _cisco-uds SRV record has been configured

Ensure that the peer address does not match the Common Name on certificate

54 / 60

Which configuration is required when implementing Mobile and Remote Access on Cisco Expressway?

Cisco Unified CM publisher address

SSO

IPS

SAML authentication

55 / 60

Refer to the exhibit.

A new neighbor zone is added for a new Cisco Meeting Server, but the zone is showing a SIP status of failed from the time the zone it was created.

What should be done to resolve this issue?

The existing zone using ID 7 must be deleted

More bandwidth must be added to the appropriate pipes

The underlying DNS issue must be resolved

The search rule must be changed to continue on match

56 / 60

For a Mobile and Remote Access deployment, which server's certificate must include the Unified registration domain as a Subject Alternate Name?

Expressway-E server certificate

Expressway-C and Expressway-E server certificate

Expressway-C server certificate

Cisco Unified Communications Manager server certificate

57 / 60

Which zone is required between Expressway-E and Expressway-C in Mobile and Remote Access deployments?

Neighbor zone

DNS zone

Traversal Zone

Unified Communications traversal zone

58 / 60

Which DNS record and port combination must be resolved externally for Mobile and Remote Access to be used?

_cisco-uds-edge on port 5061

_collab-edge on port 5061

_cisco-uds on port 8443

_collab-edge on port 8443

59 / 60

A Jabber user is being prompted to trust the Expressway-E certificate when using Mobile and Remote Access. The administrator has validated that the Expressway-E certificate is being trusted by the machine running the Jabber client.

What else can be done to solve this problem?

Change the FQDN of the Expressway

Change the domain name

Create a new CSR with new information on the SAN eld

Include Cisco Unified Communications Manager registration domain in the Expressway-E certificate as a SA

60 / 60

Which two licenses are required for the B2B feature to work? (Choose two.)

Traversal Server, TURN Relays

TURN Relays, Advanced Networking

Rich Media Sessions, Device Provisioning

Advanced Networking, Device Provisioning

Device Provisioning, Rich Media Sessions

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Free CLCEI 300-820 Exam Questions – 2025 Updated

Study Smarter for the 300-820 Exam with Our Free and Reliable 300-820 Exam Questions – Updated for 2025.

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