Cisco CIPT2 642-457 Flashcards
(95 cards)
1
Q
What is the digit analysis order in CUCM for calls leaving a cluster?
A
Route pattern > route list > route group > device (i.e. gateway, trunk, etc.)
2
Q
When is a route pattern used?
A
To send calls leaving the cluster.
3
Q
What is the best solution to overlapping extensions in a multi-site environment with distributed call processing?
A
Implement access and site codes. Use a route pattern containing the codes(s) and discard digits pre-dot.
4
Q
What is the best solution to overlapping extensions in a multi-site environment with centralized call processing?
A
Implement access and site codes. Create CSS and partition unique to each site. Add a translation pattern containing the codes(s) to the same partition and discard digits pre-dot.. Associate a CSS to this pattern that contains partitions of the other sites.
5
Q
What is the correct order to create a dial plan in CUCM?
A
Device > route group > route list > route pattern
6
Q
Where is the local route group assigned?
A
Device pool
7
Q
What is the advantage of using local route groups?
A
Reduces dial plan complexity for deployments with centralized call processing by allowing multiple sites to share a route pattern and route list rather than creating one for each site. The route list points to the standard local route group. Each device pool (i.e. site) has a unique local route group that points to the local gateway.
8
Q
Where can digit manipulation occur during call processing for calls leaving the cluster?
A
Route pattern, route list, device
9
Q
How many route patterns and route lists are required when implementing TEHO WITHOUT local route groups?
A
n * n where n equals the number of sites
10
Q
How many route patterns and route lists are required when implementing TEHO WITH local route groups?
A
n + 1 where n equals the number of sites
11
Q
Where can you configure calling-party transformation CSS for localized call egress at the phone?
A
At the device pool or the phone.
12
Q
What is the ingress number format for calls from the PSTN entering a gateway?
A
Calling = E.164 Called = E.164
13
Q
What is the globalized call routing number format for calls from the PSTN to an internal phone?
A
Calling = E.164 Called = Directory Number
14
Q
What are the threes phases of globalized call routing?
A
Call Ingress
Globalized Call Routing
Call Egress
15
Q
What is the egress number format for calls from an internal phone to the PSTN?
A
Calling = Localized E.164 Called = Localized E.164
16
Q
What are the main feature enhancements of CUCM Express in Cisco Unified SRST mode?
A
Presence, Cisco Extension Mobility, and support of local voice-mail integrations.
17
Q
What is the maximum number of phones supported in CUCM Express in Cisco Unified SRST mode?
A
450 versus 1,500 in standard SRST mode.
18
Q
MGCP gateway fallback preserves active calls from remote-site IP Phones to the PSTN when…
A
Analog or CAS is used. ISDN (CCS) call preservation is impossible because Layer 3 of the ISDN stack is disconnected from the MGCP call agent and is restarted on the local Cisco IOS gateway.
19
Q
What is the technology used to auto-configure SRST.
A
SNAP - Simple Network-Enabled Auto Provisioning
20
Q
What are the 3 SRST switchback methods?
A
Immediate switchback, graceful switchback (after all outgoing calls on the gateway are completed), or switchback after a configured delay.
21
Q
What is the default phone keepalive period?
A
30 seconds.
22
Q
What is the interval for MGCP keepalive messages to the CUCM server?
A
15 seconds. If the active CUCM server fails to acknowledge receipt of the keepalive message within 30 seconds, the gateway attempts to switch over to the next available CUCM server.
23
Q
What IOS command is used in CallManager-Fallback configuration mode to perform digit manipulation on the incoming called numbers to ensure that internal extensions can be dialed even though the lines are configured with the site code and extension?
A
dialplan-pattern
24
Q
What feature allows main site phones to call remote site phones while in fallback mode?
A
CFUR - Call Forward Unregistered. Configure in CUCM for remote site phones by using the PSTN number for CFUR.
25
List the commands to enable MGCP gateway fallback.
RemoteSite# configure terminal
RemoteSite(config)# ccm-manager fallback-mgcp
RemoteSite(config)# application
RemoteSite(config-app)# global
RemoteSite(config-app-global)# service alternate Default
RemoteSite(config-app-global)# end
RemoteSite#
26
List the commands to enable H.323 call preservation
RemoteSite# configure terminal
RemoteSite(config)# voice service voip
RemoteSite(conf-voi-serv)# h323
RemoteSite(conf-serv-h323)# call preserve
27
Where do you set Max Forward UnRegistered Hops to DN in CUCM?
System > Service Parameter > Cisco CallManager
28
What codec does CUCME support for Music On Hold?
G.711. Transcoders are required to allow G.729 to be used for MOH
29
Regarding CUCME in SRST mode, what needs to be enabled if the configured ephone is not configured with an ephone-dn?
Auto-assignment has to be enabled for the phone to be able to be associated with an ephone-dn. SNAP is not an option in this case.
30
What command enables SRST mode on an IOS gateway?
call-manager-fallback
31
What command enables CUCME in SRST mode on an IOS gateway?
telephony-service
32
Can call-manager-fallback and telephony-service be configured on a remote router at the same time?
No
33
What two features were added in CUCME version 8.0?
E.164 support and 5 additional MoH sources
34
List the main differences between SRST and CUCME.
SRST works with both SCCP and SIP, and supports more phones (up to 1,500).
CUCME works with SCCP only, and supports up to 450 phones. It has more features than SRST such as hunt groups, call park, extension mobility, and presence.
35
Describe the phone failover process.
1. Phone sends TCP keepalive every 30 seconds and does not receive a reply after the third attempt.
2. Phone tries 60 seconds each for secondary and tertiary servers in the CUCM group (if configured).
3. 10-20 seconds for SRST registration.
4. The switchback timer checks every 120 seconds to see if CUCM connection is restored.
Note: The gateway sends MGCP keepalives every 15 seconds, and will failover after 3 attempts.
36
What is the only codec supported by SRST gateways and CUCM for multicast MOH?
G.711
37
What multicast MOH settings should be the same on both SRST gateways and CUCM?
Destination address (multicast group), port address, codec, and packetization period.
38
What is the major difference between regions and locations?
Regions are used to determine the audio codec, and they consider the region of the destination device. Locations are used to set the maximum bandwidth, and they are unaware of the network topology and destination.
39
In what two ways do standard locations differ from RSVP locations?
First, RSVP can be enabled selectively between pairs of locations. Second, RSVP is aware of the WAN topology, so it works well with full mesh, partial mesh, and hub-and-spoke, and it will adapt to changes.
40
Regarding RSVP-enabled locations, how is a phone associated with it's respective RSVP agent.
Through the Media Resource Group List.
41
Regarding RSVP agents, what two messages are required for a call to be admitted?
PATH message from each sender and Resv (Reservation Request) message from each receiver.
42
Describe the difference in configuration between SIP Precondition and RSVP-enabled locations.
SIP Precondition is configured exactly the same except you also have to configure a SIP profile and apply it to the trunk.
43
Describe Automated Alternate Routing.
Designed for centralized call processing deployments. Applies to calls that are rejected due to RSVP or Locations-based Call Admission Control. Allows those calls to be routed through the PSTN instead. Only applies to directory numbers. This is NOT a failover mechanism.
44
How is the AAR group associated?
To the phone and/or directory number.
45
Regarding AAR, how does the calling phone know the PSTN number of the called phone?
It uses the external phone number mask of the called phone.
46
What are the two types of gatekeeper-controlled trunks that can be configured in CUCM and what is the difference.
Gatekeeper-controlled intercluster trunk and H.225 trunk.
The first is intended to work with CUCM releases before 3.2. The H.225 trunk works with 3.2 and later plus 3rd party devices.
47
What gatekeeper command is used to show registered trunks?
show gatekeeper endpoints
48
What information does CUCM provide to the gatekeeper?
H.323 device type – gateway or terminal (gateway is most common)
H.323 ID – based on the name of the trunk in CUCM with "_x" appended to uniquely identify the trunk.
H.323 zone – to group devices.
Technology prefix (optional) – most commonly used to indicate the services it provides (for instance, 1# for voice services, 2# for fax services, and so on).
49
Describe H.323 Gatekeeper CAC (Call Admission Control).
Multiple CUCM clusters in a distributed call processing deployment register with a gatekeeper and list the prefixes associated with their zone. The gatekeeper uses this information for call routing and address resolution. When the outgoing zone is determined, the gatekeeper just sends the call to one of the gateways or CUCM clusters that registered in the zone with the prefix.
50
What type of multisite environment can be used for Device Mobility?
Centralized call processing
51
Regarding Device Mobility, how does CUCM know they physical location of the device and which settings to apply?
The IP address of the phone
52
Regarding Device Mobility, do roaming-sensitive or mobility-related settings have an impact on call routing?
Mobilty-related settings have an impact on call routing since they modify the CSS, AAR, and AAR CSS.
53
Regarding Device Mobility, what conditions must exist for mobility-related settings to take effect?
Device changes physical location, but stays within same Device Mobility Group.
54
Regarding Device Mobility, what condition must exist for roaming-sensitive settings to take effect?
Device changes physical location. It may or may not stay within the same Device Mobility Group.
55
Regarding Device Mobility, how does the system know when the device has changed locations?
It uses the IP subnet to determine the location.
56
When are roaming-sensitive and Device Mobility-related settings applied?
Roaming-sensitive settings are applied to devices that roam between physical locations. In addition, Device Mobility-related settings are applied to devices that roam within the same Device Mobility Group.
57
Regarding Extension Mobility, what options are available if a user logs in to a second device?
Allow multiple logins, deny login (until logged out of first device), auto-logout (of first device)
58
Which devices need to be subscribed to the Extension Mobility service for it to function correctly?
The device profile, and the physical IP phone. A user might be unable to login or logout if one or both of these are missing. Use related links to subscribe to the service.
59
Regarding Extension Mobility, what is the purpose of the default device profile?
The default device profile stores default device configuration parameters that are applied by Extension Mobility when there is a mismatch between the actual phone model where the user logs in and the phone model configured in the user’s device profile.
60
How does a user login to Extension Mobility?
The user presses the Services button on the phone and chooses the Extension Mobility service from the list of phone services available at the phone. The user enters his user ID and PIN. The user then chooses the appropriate device profile (if his user ID is associateed to more than one). Otherwise the default profile is loaded automatically.
61
How does a user logout of Extension Mobility?
Users can log out of Extension Mobility by pressing the Services button again and choosing Logout in the Extension Mobility service. If users do not log out themselves, the system can be set to automatically log them out after the maximum login time expires. The administrator can configure the CUCM service parameter for the maximum login time. Users can log out only if the Extension Mobility service has been added to their profile.
62
Describe the feature safe function of Extension Mobility.
When the phone model series of the physical phone and the user device profile are the same, the feature safe function allows different phone models to be used for user device profiles and physical phone models. For example, a user with an associated device profile for a Cisco Unified IP Phone 7940 phone can log into a Cisco Unified IP Phone 7945 phone without having the default device profile applied.
63
What happens if you forget to subscribe the Device Profile to the Extension Mobility service?
The user will not have access to the service after he logs in to a phone. Therefore, he will not be able to logout.
64
What version of CUCM introduced Service Advertisement Framework and Call Control Discovery?
CUCM version 8.x
65
How do SAF forwarders communicate with each other?
SAF forwarders use the SAF Forwarding Protocol (SAF-FP) between each other.
66
How do SAF clients communicate with forwarders?
A SAF client communicates with one or more SAF forwarders using the SAF Client Protocol (SAF-CP). With CCD, the SAF client is a call agent, such as CUBE, Cisco Unified SRST, CUCM, CUCME, and Cisco IOS gateways.
67
The two components of a SAF message are SAF Head and SAF Service Data. Which component is relevant to the SAF client and which is relevant to the SAF forwarder?
The header is relevant to the forwarder. A SAF forwarder cannot interpret the SAF service data. The service data is relevant to the client.
68
SAF-FP is based on which routing protocol?
EIGRP. SAF-FP is a “service” routing protocol, not an IP routing protocol. SAF-FP routes information about services over IP networks. It is based on EIGRP technology and takes advantage of many of the features historically developed for EIGRP-based IP routing, applying this functionality to the distribution of service information.
69
Describe the relationship between a SAF client and forwarder.
The SAF client registers the forwarder. The client can advertise and/or subscribe to services on the network.
70
What relevant call routing information is provided by CCD?
Dial plan information (includes internally used directory numbers (potentially with internal prefixes, such as site codes), the IP addresses of the respective call agents, and the signaling protocol that the call agents will use)
Reachability information (no need for full mesh or gatekeepers)
71
How does CCD advertise the corresponding PSTN number for an internal number?
It uses the ToDID rule to communicate how many digits to strip followed by a colon and the prefix to be added. For example the ToDID rule would be 4:+1408555 if the internal directory number range that is being advertised is 8-567-2XXX.
72
List the critera a CCD call agent can use to filter learned/received routes.
Learned pattern prefix
Learned pattern
Remote call control identity
Remote IP
73
Which route does CUCM use if CCD learns the same destination number from multiple call agents?
If a route is learned multiple times, CUCM will load share the outbound calls to the corresponding destination among all possible paths (that is, by protocol and remote IP addresses).
74
What does CUCM do with routes learned through CCD?
All learned routes are put into one configurable partition. All devices that should have access to learned routes need that partition included in their Calling Search Space (CSS). Sometimes, the IP path for a learned route might not be available, and a ToDID rule might have been advertised with the hosted directory number. In that situation, a call to the transformed number (a ToDID rule that is applied to the advertised pattern) is placed with the Automated Alternate Routing (AAR) CSS of the calling device.
75
Regarding CCD/SAF, what CSS is used for PSTN backup.
The CSS used for the PSTN backup call is the AAR CSS of the calling phone. The route pattern, route list, route group, and gateway for PSTN access has to be in place for PSTN backup to work. Furthermore, the PSTN route pattern must be in a partition that’s reachable from the AAR CSS of the calling phone.
76
When does a call agent remove a route learned by CCD?
By default, a route is completely removed only if it has not advertised for 48 hours.
77
How do you view CCD learned routes in CUCM?
The Real-Time Monitoring Tool (RTMT).
78
How do you view CCD learned routes in CUCME?
Enter IOS command "show voice saf dndp all". Note that only a call agent can interpret SAF service data; SAF forwarders cannot interpret SAF service data. Therefore, this command works only on Cisco IOS routers that are internal SAF clients and SAF forwarders.
79
What CSS is used when a CCD-learned pattern is marked unreachable?
A PSTN backup call is placed when a learned pattern is marked unreachable and a ToDID is advertised with the pattern. The CSS that is used for this call is the AAR CSS.
80
How does an SRST gateway use CCD?
An SRST gateway does not advertise routes because CUCM should already be configured to use the PSTN when the IP WAN is down. However, an SRST gateway should still subscribe to the CCD service to learn routes. These routes are learned while the IP WAN is available and the ToDID for learned routes is used when the IP WAN is down.
81
What is the proper order in a CSS for CCD-learned patterns and statically configured patterns?
List the CCD partition first and static partitions subsequently. This will allow calls to use the CCD route first if the number matches a pattern in more than one partition.
82
What should be done if you want to use static pattern backup for CCD during PSTN failover?
If you want to use locally configured static backup patterns, either disable CCD PSTN backup by setting the CCD PSTN Failover Duration timer to 0, or set the timer to a lower value than the default (two days) by navigating in Cisco Unified CM Administration to Call Routing > Call Control Discovery > Feature Configuration.
83
What happens when CUCM loses IP connectivity to it's SAF forwarder?
It waits for 60 seconds until it considers the IP path to be unavailable. You can configure this time by configuring the CCD Learned Pattern IP Reachable Duration feature parameter by navigating in Cisco Unified CM Administration to Call Routing > Call Control Discovery > Feature Configuration. During that time, calls to learned patterns fail.
After the timer expires, CUCM starts another timer, the CCD PSTN Failover Duration. The default value for this timer is 48 hours. During this time, CUCM tries to place a CCD PSTN backup call. If no ToDID has been advertised, CUCM assumes that there is no PSTN backup path and that, therefore, calls will fail.
The learned route is purged only after the expiration of the timer.
84
Cisco IOS software cannot advertise + patterns, which breaks the ToDID rule and PSTN backup for environments that used globalized call routing. What is the workaround?
Add a translation pattern ! to a partition only accessible by the AAR CSS to match all routes and prefix +. Also add a pattern to the same partition for \+! with no digit manipulation in case the AAR CSS receives a global pattern.
85
What are the two CUCM CCD configuration modes?
- Basic configuration mode: All CUCM servers use the same primary or secondary SAF forwarders.
- Advanced configuration mode: Multiple sets of forwarders can be configured and individually applied to CUCM servers. This mode is required when clustering over the WAN deployment model is used.
86
Extension Mobility Cross Cluster requires what type of inter-cluster trunk?
SIP trunk
87
List the IOS commands to configure basic SRST.
```
call-manager-fallback
max-ephones 10
max-dn 10
ip source-address port 2000
moh flash:file.wav
dialplan-pattern 1 636555.... extension-length 4
```
Then configure dial peers, translations, and class of restriction.
88
List the IOS commands to configure CUCME with SRST.
```
telephony-service
ip source-address 10.10.10.10 port 2000
max-ephone 10
max-dn 10
srst mode auto-provision none
srst dn line-mode dual
srst dn template
srst ephone template
srst ephone description
moh flash:
multicast-moh 239.1.1.1 port 16384
load 7965
!
tftp-server flash: alias
!
voice moh-group
description
moh flash:
multicast moh 239.1.1.2 port 16384
extension-range 1020 to 1030
```
89
List the IOS commands to configure MGCP fallback.
```
ccm-manager fallback-mgcp
!
application
global
service alternate default
end
```
90
List the IOS commands to configure MGCP.
ccm-manager config server
| ccm-manager config
91
List the IOS commands to configure a SAF forwarder.
```
interface loopback1
ip address 1.1.1.1 255.255.255.255
!
router eigpr saf
!
service-family ipv4 autonomous-system 1
sf-interface loopback1
topology base
exit-sf-topology
exit-service-family
```
92
List IOS the commands to configure a SAF forwarder with external client.
```
interface loopback0
ip address 1.1.1.1 255.255.255.255
!
router eigrp SAF
!
service-family ipv4 autonomous-system 1
sf-interface loopback0
topology base
exit-sf-topology
external-client HQ_SAF
exit-service-family
!
service-family external-client listen ipv4 5050
external-client HQ_SAF
username SAFUSER
password SAFPASSWORD
```
93
List the IOS commands to configure a transcoder.
```
interface loopback0
ip address 1.1.1.1 255.255.255.255
!
voice-card 0
dspfarm
dsp services dspfarm
!
sccp local loopback0
sccp ccm x.x.x.x identifier 1 version
sccp
!
sccp ccm group 1
associate ccm 1 priority 1
associate profile 1 regsiter HQ_XCDR
!
dspfarm profile 1 transcode
codec g711
codec g729
max sessions 2
associate application sccp
no shut
```
94
List the IOS commands to configure a RSVP agent.
```
interface loopback0
ip address 1.1.1.1 255.255.255.255
!
voice-card 0
dspfarm
dsp services dspfarm
!
sccp local loopback0
sccp ccm x.x.x.x identifier 1 version x
sccp
!
sccp ccm group 1
associate ccm 1 priority 1
associate profile 1 register HQ_RSVP_MTP
!
dspfarm profile 1 mtp
codec pass-through
rspv
max sessions software 20
associate application sccp
no shut
!
interface serial 0/1
ip rsvp bandwidth 40
```
95
List the IOS commands to configure a gatekeeper with CAC.
interface loopback0
ip address 1.1.1.1 255.255.255.255
```
gatekeeper
zone local CUCM_CLUSTER_A domain.com 1.1.1.1
zone local CUCM_CLUSTER_B domain.com 1.1.1.1
zone prefix CUCM_CLUSTER_A 200*
zone prefix CUCM_CLUSTER_A 201*
zone prefix CUCM_CLUSTER_B 202*
zone prefix CUCM_CLUSTER_B 203*
bandwidth interzone default 64
gk-type-prefix 1#* default-technology
no shut
```
