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CCIE Voice Test

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Answer 50 questions in 15 minutes.
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1. How much bandwidth does a G.729 call including layer 3 require?
Put them in a route list.
Device Settings --> Softkey Template|Copy a template and make your changes.|Then apply to the device.
Ccm-manager music-on-hold
24kb/s

2. What does KPML do?
Access Port Method||interface range fa0/1 - 3|switchport voice vlan 20|switchport access vlan 10|spanning-tree portfast
Matches any length dialed number and truncates it to 4 digits.
Sends every digit to CUCM in real-time with digit-analysis being handled by CUCM.
Sh ip rsvp reservation||sh sccp connections

3. Where can you assign the AAR Group?
The name configuration field in ephone-dn and voice register dn
Assign SIP Dial Rules
Call-manager-fallback or telephony-service mode SRST
At the Line or Device level. -- Sometimes unpredictable performance of assigned to the device though.

4. How do you use an ephone template?
Gatekeeper| security acl answerarq 1||set up an access list permit whoever you want to allow
Apply it to the ephone.
CUCM Service Parameters --> Call Park Reversion Timer
You may be running into a CSA bug. Disable CSA in CUCM by:|SSH to CUCM|utils csa disable

5. Is the + character supported on a VOIP dial-peer?

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6. What are the commands to configure a MGCP Gateway? (router)
Ip domain-name ipexpert.com|network-clock-participate wic 0|isdn switch-type primary-ni||controller t1 0/0/0|pri-group timeslots 1-3 - 24 service mgcp|no shut||int serial 0/0/0:23|isdn bind-l3 ccm-manager|ccm-manager mgcp|ccm-manager redundant-host 1
(config)#sh cdp neigh detail
'Service Parameters --> Auto Answer Timer
#call-manager-fallback|#ip source-address (IP)|#max-ephone 4|max-dn 8|Configure a refernce in CUCM

7. What is the Enable Enterprise Feature Access Service Parameter used for?
Debug isdn q931
The + character is not supported on a VOIP dial-peer.||So you'll need to add back on the POTS dial-peer before it gets to the PSTN via a voice translation-rule.
Ccm-manager music-on-hold
To enable two-stage dialing.

8. How do you configure class of service (CoS) in CUCM? CME?
h225 timeout tcp establish 3 within a h323 voice class||#voice class h323 1|#h225 timeout tcp establish 3
CUCM - Partitions and Calling Search Spaces||CME - COR Lists
(config)#isdn switch-type primary-net5 (or whatever's provided)|(config)#network-clock-participate wic 0||(config)#controller e1 0/0/0|(config-controller)#pri-group timeslot 1-3|(config-controller)#no shut||(config)#int s0/0/0:15 (this is created aft
When multiple sites use the same route pattern - do your digit manipulation on a route list.

9. How do you allow H323 calls to be preserved should the primary H323 GW fail?
At the CLI: utils ntp status
Reroute when here is WAN congestion.
SERVICE PARAMETER>|| Stop routing on unallocated number flag - Set to False|| Stop routing user busy - Set to False
At the Line or Device level. -- Sometimes unpredictable performance of assigned to the device though.

10. When configuring a Gatekeep-controlled trunk - what do you do with the Wait for Far End H.245 TCS option?
You need pots dial-peers for incoming calls and you need a voip dial-peer pointing to the CUCM so the H323 GW and connect the call to those phones.
Uncheck it! Otherwise both H323 devices on either end wait for the other to send TCS first - and the connection will timeout.
Ccm-manager music-on-hold
Device Pool Locations

11. How do you ensure an H323 GW always uses the Sub as primary and Pub as a backup?
Create 2 voip dial-peers - one the Sub and one to the Pub (the Pub with a preference of 1). Then create a voice class h323and set the h225 timeout value so it will hunt between the two.
Enable MOH on the CME.||#telephony service|#moh music-on-hold.au
SERVICE PARAMETER> Automated Alternate Routing Enable > True
voice register pool|and|voice register dn

12. Calls coming from CUCM to PSTN need what?
Default is SRST||mode cme changes to CME|no mode cme changes back to SRST
Region setting alone is not enough. You must set:|Enterprise Parameters --> Advertise G.722 Codec Disable
Outbound dial-peers
#voice service voip| #no supplementary-service h225-notify cid-update

13. On a gatekeeper trunk - how do you ensure the Sub is used as primary and Pub as backup?
Gw-priority command||#gatekeeper| #zone prefix CUCM 2... gw-priority 10 US_Trunk_2| #zone prefix CUCM 2... gw-priority 5 US_Trunk_1
Yes. The media resources in the first MRG listed will be used before media resources in the second MGR listed.
#test voice translation rule 1 <input to test>
CAT IOS|switchport trunk encap dot1q|switchport mode trunk|switchport trunk native vlan 10 --> !!!DATA VLAN!!!

14. What kind of relationship does an MGCP gateway have with CUCM?
#after-hours block pattern
Show ccm-manager

Master/Slave relationship. CUCM controls it.

15. How do you configure CUCM redundancy on an H323 gateway?
#voice class h323 1| #h225 timeout tcp establish 3||#dial-peer voice 3000 voip| #destination-pattern 3...| #voice-class h323 1| #session target ipv4:(SUB IP)| #dtmf-relay h245-alpha||#dial-peer voice 30001 voip| #destination-pattern 3...| #voice-clas
No POTS dial-peer or no direct-inward-dial on a pots dial-peer
1 ... this is not optional!
Use the alias static configuration||alias static (IP of CUCM) gkid (GK ID) gateway voip ras (IP of CUCM) e164 (dn) e164 (dn) e164 (dn)

16. What are the commands to manually configure an MGCP gateway?
It matches a route pattern| Which points to a route list| Which point to a route group| Which contains a GW or Trunk|*Then it needs to match on an incoming VOIP diap-peer (incoming called -number .)
#isdn switch-type primary-ni|#network-clock-participate wic 0|#controller t1 0/0/0|#pri-group timeslots 1-3 service mgcp||#ccm-manager mgcp ccm-manager redundant-host [IP]|#ccm-manager fallback-mgcp (for srst)|#ccm-manager moh||#mgcp|#mgcp call-agent
#show call active brief|#show voice call summary|#show voice call status|show dialpeer voice summary
CUCM OS Administration Settings --> NTP Servers

17. What is the bit rate for a G.729 call excluding layer 2?
System Cisco Unified CM|Uncheck the box Auto-Reg Disabled||Enterprise Parameters --> Auto Registration Phone Protocol SIP or SCCP
Enterprise Parameters --> Organization Top Level Domain|Enterprise Parameters --> Cluster Fully Qualified Domain Name
8kb/s
+ [CC 1-3 digits] [National Number max 15 minus CC digits]

18. What terminology translates to SRST?
Reroute when there is a WAN Outage.
#isdn switch-type primary-ni|#network-clock-participate wic 0|#controller t1 0/0/0|#pri-group timeslots 1-3 service mgcp||#ccm-manager mgcp ccm-manager redundant-host [IP]|#ccm-manager fallback-mgcp (for srst)|#ccm-manager moh||#mgcp|#mgcp call-agent
IP Voice Media Streaming App
The + character is not supported on a VOIP dial-peer.||So you'll need to add back on the POTS dial-peer before it gets to the PSTN via a voice translation-rule.

19. When do you do digit manipulation at the route pattern as opposed to the route list?
voice translation-profile|and|voice translation-rule
When multiple sites use the same route pattern - do your digit manipulation on a route list.
CUCM Service Parameters --> Call Park Reversion Timer
Gw-priority command||#gatekeeper| #zone prefix CUCM 2... gw-priority 10 US_Trunk_2| #zone prefix CUCM 2... gw-priority 5 US_Trunk_1

20. When a CUCM device dials a number - what happens?
It matches a route pattern| Which points to a route list| Which point to a route group| Which contains a GW or Trunk|*Then it needs to match on an incoming VOIP diap-peer (incoming called -number .)
...
Device Settings --> Softkey Template|Copy a template and make your changes.|Then apply to the device.
Enable MOH on the CME.||#telephony service|#moh music-on-hold.au

21. In Gatekeeper CAC how do you restrict a specific endpoint?
To notify SIP Phones of NTP
#test voice translation rule 1 <input to test>
Gatekeeper|endpoint resource-threshold|endpoint max-calls h323id gk-trunk_2 1||The bandwidth command only allows restriction between zones
Higher

22. With the gw-priority command - does higher or lower priority take precedence?
CAT IOS|switchport trunk encap dot1q|switchport mode trunk|switchport trunk native vlan 10 --> !!!DATA VLAN!!!
DDI - Digit Discard Instruction (PreDot)||Mask - most powerful (does DDI and Prefix)||Prefix - Prefixes digits|| **These three types are compounded in this order!
Trunk Port Method (3750 or ESW)||interface fa0/1|switchport trunk encap dot1q|switchport mode trunk|switchport trunk native vlan 10|switchport voice vlan 20|spanning-tree portfast
Higher

23. Need to Know||Anytime you have an external call - it needs to match on a route pattern.

Need to Know||Anytime you have an external call - it needs to match on a route pattern.
Precede the # with a > ... so 9011*>#
Interface f0/0|no ip address|no shut||interface f0/0.10|encap dot1q 10 native --> !!! DATA VLAN !!!|ip address 10.10.100.1 255.255.255.0|interface f0/0.20|encap dot1q 20 --> !!! VOICE VLAN !!!|ip address 10.10.200.1 255.255.255.0

24. How do you ensure no inter-digit timeout fro SIP phones within CUCM?
Call Simulator. You can use to validate path from router to the PSTN.
Reroute when here is WAN congestion.
SIP Dial Rules
CUCM Service Parameters --> Call Park Reversion Timer

25. What command is needed on a gateway for it to invoke the DSP to convert multicast MOH stream to TDM?
#isdn switch-type primary-ni|#network-clock-participate wic 0|#controller t1 0/0/0|#pri-group timeslots 1-3 service mgcp||#ccm-manager mgcp ccm-manager redundant-host [IP]|#ccm-manager fallback-mgcp (for srst)|#ccm-manager moh||#mgcp|#mgcp call-agent
Ccm-manager music-on-hold
Assign SIP Dial Rules
(config)#clock timezone|(config)#ntp server/master|(config)#sh ntp status to verify

26. When setting up SIP URI where do you configure the CUCM's domain name?'
Show ccm-manager
CUCM OS Administration Settings --> NTP Servers

Enterprise Parameters --> Organization Top Level Domain|Enterprise Parameters --> Cluster Fully Qualified Domain Name

27. What is the full E164 format?
Gatekeeper|endpoint resource-threshold|endpoint max-calls h323id gk-trunk_2 1||The bandwidth command only allows restriction between zones
+ [CC 1-3 digits] [National Number max 15 minus CC digits]
Region setting alone is not enough. You must set:|Enterprise Parameters --> Advertise G.722 Codec Disable
Outbound dial-peers

28. On an MGCP GW - how could you see the primary and backup CUCM servers?
On CUCM it's identical to adding an H323 GW.
#voice-class h323 1|#h225 timeout tcp establish 3 (if no response within 3 seconds continue dial-peer hunting)
Apply voice-class codec
Show ccm-manager

29. How do you verify where MOH is being served up from?

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30. How do you see the details of calls coming in and out of the PRI?
Phone number followed by domain name.|i.e. 3006@ipxcme.com
Voice register dn 1| number 4002||voice register pool 1|id mac 0022.0022.0022|type 7961ge|number 1 dn 1|dtmf-relay rtp-nte|no vad
Device Settings --> Softkey Template|Copy a template and make your changes.|Then apply to the device.
Debug isdn q931

31. How would you enable security on a GK?
Ip domain-name ipexpert.com|network-clock-participate wic 0|isdn switch-type primary-ni||controller t1 0/0/0|pri-group timeslots 1-3 - 24 service mgcp|no shut||int serial 0/0/0:23|isdn bind-l3 ccm-manager|ccm-manager mgcp|ccm-manager redundant-host 1
No it invokes the RSVP call agent on the IOS Router via SCCP message. i.e. use a Software MTP.
Gatekeeper| security acl answerarq 1||set up an access list permit whoever you want to allow
(config)#clock timezone|(config)#ntp server/master|(config)#sh ntp status to verify

32. Two useful troubleshooting commands for CUCME?
1 ... this is not optional!
In the CUCM 7.0.1 Release Notes ... search for restore.
sh ephone reg|and|debug voip dialpeer
CUCM Service Parameters --> Call Park Reversion Timer

33. What does rule 1 /^.*(....$)/ /1/ do?
Service Parameters --> Mobile Voice Access Number
At the Line or Device level. -- Sometimes unpredictable performance of assigned to the device though.
Matches any length dialed number and truncates it to 4 digits.
Region setting alone is not enough. You must set:|Enterprise Parameters --> Advertise G.722 Codec Disable

34. Describe the relationship between route patterns and end devices.
Route Patterns --> Route Lists --> Route Groups --> Gateways/Trunks|RPs point to Route Lists which contain one or more Route Groups which contain one or more Gateways/Trunks.
The Called/Calling Transformations are superceded.
+ [CC 1-3 digits] [National Number max 15 minus CC digits]
1st the Subnet is recognized. (Device Mobility Info)|Then different Physical Locations are compared.

35. What are the commands to configure SIP phones in CME?
#voice service voip| #no supplementary-service h225-notify cid-update
No POTS dial-peer or no direct-inward-dial on a pots dial-peer
Telephony-service|no auto-reg-ephone|max-ephones <NUM>|max-dn <NUM> no-reg|ip source-address <IP> port 2000|create cnf-files
Voice register global|mode cme|source-address <IP>|max-dn <NUM>|max-pool <NUM>|tftp-path flash:/<PATH>|create profile||NOTE: You have to do a create profile every time you change the voice register pool

36. If you're using Called/Calling Party Transformations at the Route Pattern and tranformations at the route list ... What does the RP affect and What does the RL affect?
Telephony-service|no auto-reg-ephone|max-ephones <NUM>|max-dn <NUM> no-reg|ip source-address <IP> port 2000|create cnf-files
Voice register dn 1|number 3001|voice register pool 1|number 1 dn 1|id mac 001b.ac02.14de|type 7961|dtmf-relay rtp-nte|description 3214-3005 !!! PHONE BANNER !!!|codec g711u
RP affects the display on the calling phone.||RL affects What is sent to the gateway (called number).
Matches any length dialed number and truncates it to 4 digits.

37. What is Phone NTP Reference used for?
8kb/s
Ccm-manager music-on-hold
To notify SIP Phones of NTP
CUCM OS Administration Settings --> NTP Servers

38. How do you prioritize route groups?
DDI - Digit Discard Instruction (PreDot)||Mask - most powerful (does DDI and Prefix)||Prefix - Prefixes digits|| **These three types are compounded in this order!
At the Line or Device level. -- Sometimes unpredictable performance of assigned to the device though.
Put them in a route list.
Ephone-dn 1 <dual / octo>|number 3001|description 3214-3001 !!! PHONE BANNER !!!||ephone 1|mac-address 001b.d4c6.ca99|button 1:1|type 7961|max-calls-per-button 5|busy-trigger-per-button 3

39. How do you configure DHCP in IOS?
Bottom up - to prevent glare.
(config)#service dhcp|(config)#no ip dhcp conflict logging|(config)#ip dhcp excluded-address <low IP> <hi IP>|(config)#ip dhcp-pool <name>|(dhcpconfig)#network <network name> </nn or mask>|(dhcpconfig)#domain-name <domain>|(dhcpconfig)#dns-server <IP
Re-enter the mgcp bind control and mgcp bind media commands.
Device Pool Locations

40. How do you change modes in voice register global?
You need dial-peers and to allow h323 to h323 communication.||voice service voip| allow-connections h323 to h323
Default is SRST||mode cme changes to CME|no mode cme changes back to SRST
Device Settings --> Softkey Template|Copy a template and make your changes.|Then apply to the device.
(config)#service dhcp|(config)#no ip dhcp conflict logging|(config)#ip dhcp excluded-address <low IP> <hi IP>|(config)#ip dhcp-pool <name>|(dhcpconfig)#network <network name> </nn or mask>|(dhcpconfig)#domain-name <domain>|(dhcpconfig)#dns-server <IP

41. When do you use translate called? Translate calling?
Auto Call Pickup Enabled
voice register pool|and|voice register dn
Translate called - Calls going out to the PSTN||Translate Calling - Use on calls coming in from the PSTN. To change the ANI (Caller ID)
(config)#voice register dialplan

42. When you make a call and it results in a secondary dial-tone - What is this a symptom of?
No POTS dial-peer or no direct-inward-dial on a pots dial-peer
Find the GUI Files - show flash | i .html|ip http server|ip http path flash:/<PATH TO FILES>||telephony service|web admin system name admin pass cisco|dn-webedit
At the Line or Device level. -- Sometimes unpredictable performance of assigned to the device though.
1. Enable it.|2. Create AAR Group|3. Create CSS-AAR and apply at device level.|4. Apply AAR Group at line level.

43. How do you block calls under call-manager-fallback?
#after-hours block pattern
To notify SIP Phones of NTP
In milliseconds ... allows you to hang up cell phone then pick up at the desk phone without disconnecting the call.
Matches any length dialed number and truncates it to 4 digits.

44. How do you enable AAR?
SERVICE PARAMETER> Automated Alternate Routing Enable > True
1 ... this is not optional!
Call forwarding between voip to voip (when CUBE is in play)
AAR -- Used for WAN Congestion|SRST -- Used for WAN Outage

45. Where do you use VIA zone?
Access Port Method||interface range fa0/1 - 3|switchport voice vlan 20|switchport access vlan 10|spanning-tree portfast
Via the voice hunt-group parallel command
Gatekeeper - zone local GK cisco.com 10.1.6.1 - zone local CUCM cisco.com invia GK outvia GK - zone local BR2 cisco.com invia GK outvia GK
(config)#int s0/0/0:15 (this is created after you setup the PRI)|(config-if)#isdn outgoing display-ie

46. If you have an H323 Gateway at a siet where the phones are controlled by CUCM - what do you need from a dial-peer perspective?
#after-hours block pattern
Auto Call Pickup Enabled
Dial-peers
You need pots dial-peers for incoming calls and you need a voip dial-peer pointing to the CUCM so the H323 GW and connect the call to those phones.

47. How do you set the inter-digit timeout for SIP phones in CME?
voice register pool|and|voice register dn
Vlan database|vlan 130 name DATA|vlan 240 name PHONES|apply|exit
No POTS dial-peer or no direct-inward-dial on a pots dial-peer
(config)#voice register dialplan

48. How do you configure AAR?
1. Enable it.|2. Create AAR Group|3. Create CSS-AAR and apply at device level.|4. Apply AAR Group at line level.
8kb/s
Call Simulator. You can use to validate path from router to the PSTN.
Create 2 voip dial-peers - one the Sub and one to the Pub (the Pub with a preference of 1). Then create a voice class h323and set the h225 timeout value so it will hunt between the two.

49. What is the Service Parameter to allow the phone that is picking ip to auto answer?
Auto Call Pickup Enabled
#isdn switch-type primary-ni|#network-clock-participate wic 0|#controller t1 0/0/0|#pri-group timeslots 1-3 service mgcp||#ccm-manager mgcp ccm-manager redundant-host [IP]|#ccm-manager fallback-mgcp (for srst)|#ccm-manager moh||#mgcp|#mgcp call-agent
#call-manager-fallback|#ip source-address (IP)|#max-ephone 4|max-dn 8|Configure a refernce in CUCM
Configure it on the route group through the route list - then it will be local to the route list.

50. How do you prevent toll fraud on CUCM?
IP Voice Media Streaming App
(config)#voice register dialplan
When I call in from off-net to a DID number in-net ... once authenticated - your calls appear to come from the desk phone.
SERVICE PARAMETER>|| Block Offnet to Offnet Transfer - Set to True

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CCIE Voice Test

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