Deck 42: Developing Applications using Cisco Core Platforms and APIs (DEVCOR)

Question 1

Which version is used to provide encryption for SNMP management traffic in collaboration deployments?

A) SNMPv2c
B) SNMPv2
C) SNMPv1
D) SNMPv3

Answer 1

SNMPv3

Question 2

Which two functionalities does Cisco Expressway provide in the Cisco Collaboration architecture? (Choose two.)

A) Survivable Remote Site Telephony functionality
B) customer interaction management services
C) secure firewall and NAT traversal for mobile or remote Cisco Jabber and TelePresence Video endpoints
D) MGCP gateway registration
E) Secure business-to-business communications

Answer 2

secure firewall and NAT traversal for mobile or remote Cisco Jabber and TelePresence Video endpoints
Secure business-to-business communications

Question 3

Which SNMP service must be activated manually on the Cisco UCM after installation?

A) Host Resources Agent
B) Cisco CallManager SNMP
C) Connection SNMP Agent
D) SNMP Master Agent

Answer 3

Cisco CallManager SNMP

Question 4

What is a software-based media resource that is provided by the Cisco IP Voice Media Streaming Application?

A) video conference bridge
B) auto-attendant
C) transcoder
D) annunciator

Question 5

When a user dials a number with a phone that is registered to the Cisco Unified Communications Manager, what is the default timeout before the number is sent?

A) 15 seconds
B) 5 seconds
C) 10 seconds
D) 3 seconds

Question 6

A presence redundancy group is deployed, and an engineer initiates a manual fallback. Which statement about Cisco Server Recovery Manager is true?

A) disconnects all users that had been failed over, and the users must log in again
B) disconnects all users that had been failed over
C) restarts critical services on the secondary node
D) restarts the Cisco Presence Engine

Question 7

On a Cisco Catalyst Switch, which command is required to send CDP packets on a switch port that configures a Cisco IP phone to transmit voice traffic in 802.1Q frames, tagged with the voice VLAN ID 221?

A) Device(config-if)# switchport trunk allowed vlan 221
B) Device(config-if)# switchport vlan voice 221
C) Device(config-if)# switchport voice vlan 221
D) Device(config-if)# switchport access vlan 221

Question 8

A user dials 9011841234567 to reach Vietnam. Which steps send the call to the PSTN provider as 011841234567?

A)
B)
C)
D)

Question 9

An administrator recently upgraded a Cisco Webex DX80 through its web interface but discovered the next morning that the unit has received to its previous version. What must the administrator do to prevent this from happening again?

A) Assign a phone security profile with secure SIP.
B) Set the prepare cluster for rollback to pre-8.0 enterprise parameter to true.
C) Confirm the phone load name in the phone configuration.
D) Assign a universal device template to the phone.

Question 10

When configuring Cisco UCM, which configuration enables phones to automatically reregister to a Cisco UCM publisher when the connection to the subscriber is lost?

A) SRST
B) Route Group
C) Device Pool
D) Cisco UCM Group

Question 11

Which statement about Cisco Unified Communications Manager and Cisco IM and Presence backups is true?

A) Backups should be scheduled during off-peak hours to avoid system performance issues.
B) Backups are saved as .tar files and encrypted using the web administrator account.
C) Backups are saved as unencrypted.tar files.
D) Backups are not needed for subscriber Cisco Unified Communications Manager and Cisco IM and Presence servers.

Question 12

When a new SIP phone is registered to Cisco Unified Communications Manager, it keeps failing and showing an "unprovisioned" error message in the phone display. Which problem is a possible cause of this issue?

A) Auto-registration is disabled on the Cisco Unified Communications Manager nodes and the phone device does not have a DN configured.
B) The DN assigned to the phone is already in use by another SIP phone.
C) The phone cannot download and install the latest firmware.
D) The DHCP settings are set incorrectly and the phone does not have an alternate TFTP defined.
E) The DN configuration for this phone is shared with an SCCP phone, which is not supported.

Question 13

Which configuration step is necessary for a Cisco SIP phone to synchronize its time with a specific source?

A) Add a Phone NTP Reference to the Date/Time Group.
B) Assign the device to the correct region.
C) Change the Time Format from 24-hour to 12-hour.
D) Change the Time Zone from "America/Los_Angeles" to "Etc/GMT+8".

Question 14

When setting a new primary DNS server in the Cisco UCM CLI, what is required for the change to take affect?

A) restart of CallManager service
B) restart of DirSync service
C) restart of the network service
D) restart of TFTP service

Question 15

A customer wants a video conference with five Cisco TelePresence IX5000 Series systems. Which media resource is necessary in the design to fully utilize the immersive functions?

A) Cisco PVDM4-128
B) software conference bridge on Cisco Unified Communications Manager
C) Cisco Webex Meetings Server
D) Cisco Meeting Server

Question 16

Which two functions are provided by Cisco Expressway Series? (Choose two.)

A) interworking of SIP and H.323
B) endpoint registration
C) intercluster extension mobility
D) voice and video transcoding
E) voice and video conferencing

Question 17

What are two key features of the Expressway series? (Choose two.)

A) IP to PSTN call connectivity
B) B2B calls
C) VPN connection toward the internal UC resources
D) SIP header modification
E) device registration over the Internet

Question 18

What is the validity period of the ITL Recovery certificate in Cisco UCM?

A) 1 year
B) 20 years
C) 5 years
D) 10 years

Question 19

An engineer must extend the corporate phone system to mobile users connecting through the internet with their own devices. One requirement is to keep that as simple as possible for end users. Which infrastructure element achieves these goals?

A) Cisco Express Mobility
B) Cisco Expressway-C and Expressway-E
C) Cisco Unified Border Element
D) Cisco Unified Instant Messaging and Presence

Question 20

Which two conditions must a user meet to provision a new device using the Self-Provisioning feature? (Choose two.)

A) The user must have a primary extension.
B) At least two DNs must be assigned to the user device.
C) The user must be part of "Standard CCM Super User".
D) The user must have the appropriate universal device template linked to the user profile.
E) The user must have at least one user device profile assigned.

Question 21

An end user at a remote site is trying to initiate an Ad Hoc conference call to an end user at the main site. The conference bridge is configured to support G.711. Remote user's phone only supports G.729. The remote end user receives an error message on the phone: "Cannot Complete Conference Call." What is the cause of the issue?

A) A software conference bridge is not assigned
B) The remote phone does not have the conference feature assigned
C) A Media Termination Point is missing
D) The transcoder resource is missing

Question 22

Which datastore and protocol is used for saving back-up files within the Disaster Recovery System of Cisco UCM?

A) local disk on the Cisco UCM server
B) remote disk on the SFTP server
C) remote disk on a CIFS share
D) remote disk on an NFS share

Question 23

On which protocol and port combination does Cisco Prime Collaboration receive notifications (Traps and InformRequests) from several network devices in the Collaboration infrastructure for which it has requested notifications?

A) UDP 162
B) TCP 80
C) UDP 161
D) TCP 161

Question 24

An engineer is configuring a Cisco Unified Border Element to allow the video endpoints to negotiate without the Cisco Unified Border Element interfering in the process. What should the engineer configure on the Cisco Unified Border Element to support this process?

A) Configure codec transparent on the dial peers.
B) Configure a transcoder for video protocols.
C) Configure a hardcoded codec on the dial peers.
D) Configure pass-thru content sdp on the voice service.

Question 25

Which command is used in Cisco IOS XE TDM gateway to configure the voice T1/E1 controller to provide clocking?

A) clock source line
B) Cisco IOS XE TDM gateway T1/E1 controller cannot provide clocking.
C) clock source internal
D) clock source network

Question 26

Which DTMF relay method configured on a SIP dial-peer will ensure that a media resource is not invoked by Unified CM for calls to UCCX IVRs?

A) sdtmf-relay h245-signal
B) dtmf-relay rtp-nte
C) dtmf-relay sip-notify
D) dtmf-relay sip-kpml

Question 27

An engineer wants to manually deploy a Cisco Webex DX80 video endpoint to an end user. Which type of provisioning can be configured on the endpoint?

A) CUBE
B) CMS
C) CUCM
D) Edge

Question 28

Refer to the exhibit. Endpoint A calls endpoint B. What is the only audio codec that can be used for the call?

A) Telephone-event/8000
B) G7221/16000
C) PCMA/8000
D) G722/8000

Question 29

An engineer must manually provision a Cisco IP Phone 8845 using SIP. Which two fields must be configured for a successful provision? (Choose two.)

A) location
B) media resources group list
C) SIP profile
D) CSS
E) device security profile

Question 30

Which two steps should be taken to provision a phone after the Self-Provisioning feature was configured for end users? (Choose two.)

A) Dial the hunt pilot extension and associate the phone to an end user
B) Plug the phone into the network
C) Ask the Cisco UCM administrator to associate the phone to an end user
D) Enter settings menu on the phone and press *, *,#(star, star, pound)
E) Dial the self-provisioning IVR extension and associate the phone to an end user

Question 31

Which transport protocol does the application layer protocol SNMP use?

A) XML
B) UDP
C) SIP
D) HTTP

Question 32

Refer to the exhibit. Calls to Cisco Unity Connection are failing across Cisco Unified Border Element when callers try to select a menu prompt. Why is this happening and how is it fixed?

A) Cisco Unified Border Element is sending the incorrect media IP address. The IP address of the loopback interface must be advertised in the SDP.
B) Cisco Unity Connection is configured on G.729 only. Cisco Unity Connection must be reconfigured to support iLBC.
C) Cisco Unified Border Element is not sending any support for DTMF. DTMF configuration must be added to the appropriate dial peer.
D) The Cisco Unity Connection Call Handler is configured for a "Release to Switch" transfer type. Transfers must be disabled for the Cisco Unity Connection Call Handler.

Question 33

Endpoint A is attempting to call endpoint B. Endpoint A only supports G.711ulaw with a packetization rate of 20 ms, and endpoint B supports packetization rate of 30 ms for G.711ulaw. Which two media resources are allocated to normalize packetization rates through transrating? (Choose two.)

A) software transcoder on Cisco UCM
B) hardware transcoder on Cisco IOS Software
C) software MTP on Cisco IOS Software
D) software MTP on Cisco UCM
E) hardware MTP on Cisco IOS Software

Question 34

How can an administrator stop Cisco Unified Communications Manager from advertising the OPUS codec for recording enabled devices?

A) Route recorded calls through Cisco Unified Border Element because it does not support OPUS.
B) Go to the phone's configuration page and set "Advertise OPUS Codec" to be "false".
C) Integrate the Cisco Unified CM with 3 recording solution that does not support OPUS.
D) In CUCM Service Parameters set "Opus Codec Enabled" to "Enabled for all Devices Except Recording-Enabled Devices."

Question 35

An engineer is configuring IP telephony. The network relies on DHCP to provide TFTP server addresses to the endpoints. Policy requires the endpoints to receive two server addresses. Which DHCP option must be configured?

A) 66
B) 143
C) 150
D) 166

Question 36

Refer to the exhibit. An administrator is attempting to register a SIP phone to a Cisco UCM but the registration is failing. The IP address of the SIP Phone is 10.117.34.222 and the IP address of the Cisco UCM is 10.0.101.10. Pings from the SIP phone to the Cisco UCM are successful. What is the cause of this issue and how should it be resolved?

A) An NTP mismatch is preventing connection of the TCP session between the SIP phone and the Cisco UCM. The SIP phone and Cisco UCM must be set with identical NTP sources.
B) The certificates on the SIP phone are not trusted by the Cisco UCM. The SIP phone must generate new certificates.
C) DNS lookup for the Cisco UCM FQDN is failing. The SIP phone must be reconfigured with the proper DNS server.
D) A network device is blocking TCP port 5060 from the SIP phone to the Cisco UCM. This device must be reconfigured to allow traffic from the IP phone.

Question 37

Refer to the exhibit. A Cisco UCM user with directory number 4401 dials 5507, and the call is routed to a Cisco Unified Border Element. Which IP address will the call be sent to?

A) 10.0.0.2
B) 10.0.0.3
C) 10.0.0.4
D) 10.0.0.1

Question 38

Refer to the exhibit. When a UC Administrator is troubleshooting DTMF negotiated by this SIP INVITE, which two messages should be examined next to further troubleshoot the issue? (Choose two.)

A) REGISTER
B) UPDATE
C) PRACK
D) NOTIFY
E) SUBSCRIBE

Question 39

Which command in the MGCP gateway configuration defines the secondary Cisco Unified Communications Manager server?

A) mgcpapp
B) ccm-manager fallback-mgcp
C) mgcp call-agent
D) ccm-manager redundant-host

Question 40

Refer to the exhibit. A call is failing to establish between two SIP Devices. The called device answers with this SDP. Which SDP parameter causes this issue?

A) The payload for G.711ulaw must be 18.
B) The calling device did not offer a ptime value.
C) The media stream is set to sendonly.
D) The RTP port is set to 0.

Question 41

An engineer configures local route group names to simplify a dial plan. Where does the engineer set the route groups according to the local route group names that are configured?

A) CSS
B) route pattern
C) device pool
D) route list

Question 42

An engineer with ID012345678 must build an international dial plan in Cisco Unified Communications Manager. Which action should be taken when building a variable-length route pattern?

A) reduce the T302 timer to less than 4 seconds
B) configure single route pattern for international calls
C) create a second route pattern followed by the # wildcard
D) set up all international route patterns to 0.!

Question 43

Refer to the exhibit. Given this "debug isdn q921" output, what is the problem with the PRI?

A) Layer 1 is down on the controller.
B) PRI does not have an IP address configured on the interface.
C) Nothing, the PRI is sending keepalives.
D) Layer 2 is down on the controller.

Question 44

An engineer configures Cisco Unified Communications Manager to prevent toll fraud. At which two points does the engineer block the pattern in Cisco Unified CM to complete this task? (Choose two.)

A) route pattern
B) route group
C) translation pattern
D) partition
E) CSS

Question 45

Which call flow matches traffic from a Mobile and Remote Access registered endpoint to central call control?

A) Endpoint > Expressway-E > Expressway-C > Cisco Unified CM
B) Endpoint > Expressway-E > Cisco Unified CM
C) Endpoint > Expressway-C > Cisco Unified CM
D) Endpoint > Expressway-C > Expressway-E > Cisco Unified CM

Question 46

Which method is used to avoid toll fraud with Cisco Unified Communications Manager calls?

A) call policy service
B) TOLLFRAUD_APP
C) default zone access rules
D) class of service

Question 47

When a phone is registered over Mobile and Remote Access, where does it register?

A) Cisco Unified Presence Server
B) Expressway-E
C) Cisco Unified Communications Manager
D) Expressway-C

Question 48

Refer to the exhibit. What is a possible cause of the PRI issue?

A) The cable is unplugged.
B) The clock source is incorrect.
C) The controller shut down.
D) The framing is configured incorrectly.

Question 49

How does Cisco Unified Communications Manager perform a digit analysis on-hook versus off-hook for an outbound call from a Cisco IP phone that is registered to Cisco Unified CM?

A) On-hook, Unified CM performs a digit-by-digit analysis; off-hook, Unified CM considers all digits were dialed and does not wait for additional digits.
B) On-hook, Unified CM considers all digits were dialed and does not wait for additional digits; off-hook, Unified CM performs a digit-by-digit analysis.
C) On-hook, by pressing the digits and entering "#" to process the call, Unified CM performs a digit-by-digit analysis; off-hook, Unified CM analyzes all digits as a string.
D) On-hook, no digit analysis is performed; off-hook, Unified CM requires the "#* to start the digit analysis.

Question 50

A customer is deploying a SIP IOS gateway for a customer who requires that in-band DTMF relay is first priority and out-of-band DTMF relay is second priority. Which IOS entry sets the required priority?

A) dtmf-relay rtp-nte sip-notify
B) dtmf-relay cisco-rtp
C) sip-notify dtmf-relay rtp-nte
D) dtmf-relay sip-kpml cisco-rtp

Question 51

Which action is required if an engineer wants to have Cisco Unified Communications Manager control the configuration for an MGCP gateway?

A) Apply the ccm-manager configuration commands to the gateway.
B) Upload the custom configuration in the TFTP server in Cisco Unified CM.
C) From Cisco Unified CM > Device > Gateway > Add gateway, check the auto-configuration check box.
D) Configure the Cisco Unified CM's IP in voice service VoIP.

Question 52

A user reports that when receiving an inbound call on their IP Phone from the PSTN they are unable to transfer this call to another PSTN number. What is the reason for this failures?

A) The IP phone is configured with the wrong region.
B) The incoming calling search space of the SIP trunk does not include the partition of the line in the IP phone.
C) The service parameter related to Offnet to Offnet Call Transfer is set to TRUE.
D) The gateway is configured with the wrong device pool.

Question 53

Given the H.323 gateway configuration and using Cisco best practices, how must the called party transformation pattern be configured to ensure that a proper ISDN type of number is set?

A)
B)
C)
D)

Question 54

An administrator is trying to change the default LINECODE for a voice ISDN T1 PRI. Which command makes this change?

A) linecode esf
B) linecode ami
C) linecode hdb3
D) linecode b8zs

Question 55

Which description of the Mobile and Remote Access feature is true?

A) Collaboration Edge feature that enables remote individuals to perform international calls from Jabber with a VPN connection.
B) Collaboration Edge feature that enables remote individuals to access all enterprise collaboration services using a PC within the corporate environment.
C) Collaboration Edge feature that enables remote individuals to access enterprise collaboration services via Jabber without the use of a VPN connection.
D) Collaboration Edge feature that enables remote individuals to access enterprise collaboration services via Jabber with the use of a VPN connection.

Question 56

A user forwards a corporate number to an international number. What are two methods to prevent this forwarded call? (Choose two.)

A) Set the Call Classification to OnNet for the international route pattern.
B) Block international dial patterns in the SIP trunk CSS.
C) Configure a Forced Authorization Code on the international route pattern.
D) Set Call Forward All CSS to restrict international dial patterns.
E) Check Route Next Hop By Calling Party Number on the international route pattern.

Question 57

What field is configured to change the caller ID information on a SIP route pattern?

A) Route Partition
B) Called Party Transformation Mask
C) Calling Party Transformation Mask
D) Connected Line ID Presentation

Question 58

Which call routing pattern is used for phone numbers that are in the E.164 format?

A) \+.! Route Pattern
B) \+.! Translation Pattern
C) /+.! Route Pattern
D) \+1.[2-9]XX[2-9]XXXXXX Called Party Transformation Pattern

Question 59

Multiple route patterns match a number. How does Cisco Unified Communications Managers determine which pattern to use?

A) the one that comes first in numerical order
B) the one with the longest match
C) the one with the closest match
D) the one that discards everything PreDot

Question 60

Which command must be defined before an administrator changes the linecode value on an ISDN T1 PRI in slot 0/2 on an IOS-XE gateway?

A) voice-port 0/2/0:23
B) isdn incoming-voice voice
C) card type t1 0 2
D) pri-group timeslots 1-24

Question 61

Which action enables Cisco MRA?

A) Internal SIP clients registered to Cisco UCM can call external companies
B) Clients such as Cisco Jabber can use call control on Cisco UCM
C) VPN connectivity can be established to Cisco UCM
D) Cisco UCC Express clients can obtain VPN connectivity to Cisco UCC Enterprise

Question 62

Which Cisco UCM feature is used to determine the maximum bit rate for a call between two video endpoints?

A) partitions
B) locations
C) regions
D) transformations

Question 63

Which statement describes the outcome when the trust boundary is defined at the Cisco IP phone?

A) Packets or Ethernet frames are remarked at the access layer switch.
B) Packets or Ethernet frames are not remarked by the IP phone.
C) Packets or Ethernet frames are not remarked at the access layer switch.
D) Packets or Ethernet frames are remarked at the distribution layer switch.

Question 64

What causes poor voice quality and video pixelization in a video call?

A) The QoS is configured incorrectly.
B) A firewall is blocking the RTP ports.
C) Cisco Unified Communications Manager is configured to use G.711 instead of G.729.
D) 1 Gbps network ports are used instead of 100 Mbps network ports.

Question 65

Which user group is targeted by MRA services?

A) production floor users who need wireless mobility in remote areas of the factory
B) mobile workers in a hot desk environment at HQ who log in every morning at possibly a different desk phone
C) on-the-go mobile workforce who connect to corporate phone services using their own mobile device
D) call center agents who dial out to remote customers

Question 66

An engineer is configuring a BOT device for a Jabber user in Cisco Unified Communication Manager Which phone type must be selected?

A) third-party SIP device
B) Cisco Dual Mode for iPhone
C) Cisco Dual Mode for Android
D) Cisco Unified Client Services Framework

Question 67

An engineer implements QoS in the enterprise network. Which command can be used to verify the correct classification and marking on a Cisco IOS switch?

A) show class-map interface GigabitEthernet 1/0/1
B) show policy-map interface GigabitEthernet 1/0/1
C) show policy-map
D) show access-lists

Question 68

An engineer with troubleshoots poor voice quality on multiple calls. After looking at packet captures, the engineer notices high levels of jitter. Which two areas does the engineer check to prevent jitter? (Choose two.)

A) The network meets bandwidth requirements.
B) MTP is enabled on the SIP trunk to Cisco Unified Border Element.
C) Cisco UBE manages voice traffic, not data traffic.
D) All devices use wired connections instead of wireless connections.
E) Voice packets are classified and marked.

Question 69

There is a saturated link that has traffic shaping configured. How is incoming traffic processed?

A) Traffic is compressed so that the traffic fits within the bandwidth of the link.
B) Excess traffic is queued, and then dropped after the timer expires.
C) Excess traffic is queued for later transmission.
D) Excess traffic is dropped.

Question 70

Why would we not include an end user's PC device in a QoS trust boundary?

A) The end user could incorrectly tag their traffic to bypass firewalls.
B) The end user may incorrectly tag their traffic to be prioritized over other network traffic.
C) There is no reason not to include an end user's PC device in a QoS trust boundary.
D) The end user could incorrectly tag their traffic to advertise their PC as a default gateway.

Question 71

Which access control group is required on an end user to allow Jabber to do deskphone mode?

A) Allow Control of Device from CTI
B) Standard CTI Enabled
C) Standard CTI Allow Reception of SRTP Key Material
D) Standard CTI Secure Connection

Question 72

What is set when using CoS to mark an Ethernet frame?

A) IPP bits
B) DCSP bits
C) IP ECN bits
D) 802.1p User Priority bits

Question 73

Which two approaches are taken to implement CAC within Cisco UCM in full-mesh topology? (Choose two.)

A) physical location
B) Audio Codec Preference List
C) location-based CAC
D) RSVP-enabled locations
E) device pool

Question 74

Which field of a Real-Time Transport Protocol packet allows receiving devices to detect lost packets?

A) timestamp
B) CSRC (Contributing source ID)
C) sequence number
D) SSRC (Synchronization source identifier)

Question 75

Which two configuration elements are part of the Cisco Unified Communications Manager toll-fraud prevention? (Choose two.)

A) SIP trunk security profile
B) Calling Search Space
C) SUBSCRIBE Calling Search Space
D) feature control policy
E) partition

Question 76

How are E.164 called-party numbers normalized on a globalized call-routing environment in Cisco Unified Communications Manager?

A) Normalization is achieved by stripping or translating the called numbers to internally used directory numbers.
B) Normalization is achieved by setting up calling search spaces and partitions at the SIP trunks for PSTN connection.
C) Call ingress must be normalized before the call being routed.
D) Normalization is not required.

Question 77

Which two DNS records must be created to configure Service Discovery for on-premises Jabber? (Choose two.)

A) _cisco-uds._tls.cisco.com pointing to the IP address of Cisco Unified Communications Manager
B) _cuplogin._tcp.cisco.com pointing to a record of IM&P
C) _cuplogin._tls.cisco com pointing to the IP address of IM&P
D) _cisco-uds._tcp.cisco com painting to a record of Cisco Unified CM
E) _xmpp._tls.cisco.com pointing to a record of IM&P

Question 78

Which configuration on Cisco Unified Communications Manager is required for SIP MWI to work?

A) The line partition must be inside the inbound CSS assigned to the CUC SIP trunk.
B) The line partition must be inside the rerouting CSS assigned to the Cisco Unity Connection SIP trunk.
C) Set the "Enable message waiting indicator" on the port group.
D) Assign a MWI extension on the mailbox.

Question 79

Which DiffServ marking is the most likely to drop packets?

A) AF13
B) AF12
C) AF11
D) AF32

Question 80

End users report bad video quality and voice choppiness on Cisco Collaboration endpoints. The engineer changed the device pool the users were in but did not correct the problem. Which action should be taken to troubleshoot this issue?

A) Restart the Cisco Location Bandwidth Manager service on the Cisco UCM publisher
B) Check for duplex/speed mismatches between the network port settings of the system and network switch
C) Use direct IP address calls between two endpoints to troubleshoot call quality issues
D) Set the service parameter Use Video Bandwidth Pool for Immersive Video Calls to "false"