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CCIE Voice Test

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Answer 50 questions in 15 minutes.
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1. How do you enable AAR?
(config)#isdn switch-type primary-ni|(config)#network-clock-participate wic 0||(config)#controller t1 0/0/0|(config-controller)#pri-group timeslots 1-3|(config-controller)#no shut||(config)#voice service voip|(conf-voi-serv)#sip|(conf-serv-sip)#bind
SERVICE PARAMETER> Automated Alternate Routing Enable > True
#int lo0|#h323-gateway voip bind srcaddr [IP]||#isdn switch-type primary-ni|#network-clock-particpate wic0||#controller t1 0/0/0|#pri-group timeslots 1-3||#int serial 0/0/0:23|#isdn outgoing display-ie|#isdn b-chan selection order [use opposite of wh
+ [CC 1-3 digits] [National Number max 15 minus CC digits]

2. What kind of relationship does an MGCP gateway have with CUCM?
1. Complicated Hunt Group|2. Need to support Calling Name|3. Need to support Call Park Call Pickup
Mobile Voice Access
Master/Slave relationship. CUCM controls it.
Call Simulator. You can use to validate path from router to the PSTN.

3. What are the 3 mandatory commands within call-manager-fallback?

Max-dn|max-ephone|ip source-address
voice register pool|and|voice register dn
Via the voice hunt-group parallel command

4. How do you prevent toll fraud on CME?
Vlan database|vlan 130 name DATA|vlan 240 name PHONES|apply|exit
The Called/Calling Transformations are superceded.
Transfer to external is blocked by default.|To ensure only transfer to internal is allowed - make sure only the following tx pattern is under telephony-service||#telephony service| #transfer-pattern ....
Device Settings --> Softkey Template|Copy a template and make your changes.|Then apply to the device.

5. What is SIP URI?
Automatically configures the MGCP GW for you.
Gatekeeper|endpoint resource-threshold|endpoint max-calls h323id gk-trunk_2 1||The bandwidth command only allows restriction between zones
Phone number followed by domain name.|i.e. 3006@ipxcme.com
#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

6. When it comes to H323 gateways - what should you always change - unless explicitly told not to?
+ [CC 1-3 digits] [National Number max 15 minus CC digits]
(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
SERVICE PARAMETER>|| Stop routing on unallocated number flag - Set to False|| Stop routing user busy - Set to False
(config)#int s0/0/0:15 (this is created after you setup the PRI)|(config-if)#isdn outgoing display-ie

7. What dtmf-relay type do you use for an H323 GW?
Precede the # with a > ... so 9011*>#
Transfer to external is blocked by default.|To ensure only transfer to internal is allowed - make sure only the following tx pattern is under telephony-service||#telephony service| #transfer-pattern ....
Dtmf-relay h245-alpha
Call-manager-fallback or telephony-service mode SRST

8. How can you confirm the MGCP GW is registered to CUCM - in IOS?
Mobile Connect
(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
Sh ccm-manager
Redundant dial plan. One on CUCM and one on the routers via dial-peers.

9. When are digits stripped in a gateway?
CUCM OS Administration Settings --> NTP Servers
Service Parameters --> Mobile Voice Access Number
When they are explicitly matched in a destination-pattern in a dial-peer.
Matches any length dialed number and truncates it to 4 digits.

10. 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?
1. Complicated Hunt Group|2. Need to support Calling Name|3. Need to support Call Park Call Pickup
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.
When they are explicitly matched in a destination-pattern in a dial-peer.
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.

11. How do you setup AutoRegistration in CUCM?
SIP Dial Rules
Configure it on the route group through the route list - then it will be local to the route list.
System Cisco Unified CM|Uncheck the box Auto-Reg Disabled||Enterprise Parameters --> Auto Registration Phone Protocol SIP or SCCP
At the Line or Device level. -- Sometimes unpredictable performance of assigned to the device though.

12. How do you create a trunk on the switch side?
In CUCM - configure CFUR to point to it's E164 number.
CAT IOS|switchport trunk encap dot1q|switchport mode trunk|switchport trunk native vlan 10 --> !!!DATA VLAN!!!
Max-dn|max-ephone|ip source-address
Uncheck it! Otherwise both H323 devices on either end wait for the other to send TCS first - and the connection will timeout.

13. How do you block calls under call-manager-fallback?
CAT IOS|switchport trunk encap dot1q|switchport mode trunk|switchport trunk native vlan 10 --> !!!DATA VLAN!!!
Higher
#after-hours block pattern
Dtmf-relay h245-alpha

14. When using drop-through-option What is the max number of huntgroups?
'Use before the ... so XXXX
Auto Call Pickup Enabled
On CUCM -- UPTSAL||Create Your Users|Phone - set owner id|Create SIP Trunk|SIP Trunk Security Profile||Application Server|Licensing||||On CUPS||Work Left to right
1 ... this is not optional!

15. How do you configure SIP phones to be able to call other SIP phones via SIP URI?
'Use before the ... so XXXX
Service Parameters --> Mobile Voice Access Number
The name configuration field in ephone-dn and voice register dn
SIP Route Pattern over a SIP Trunk.

16. What is CSIM?
#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
Ssh to the CUCM the phone is registered to|show perf query class 'Cisco MOH Device'
Call Simulator. You can use to validate path from router to the PSTN.
(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

17. On an MGCP GW - if you select Top Down under Channel Selection Order - What does that mean?
Via the voice hunt-group parallel command
Top Down means that channel 1 will be the first channel used to place outgoing calls.
Outbound dial-peers
Apply it to the ephone.

18. What should you configure before entering auto qos?
Bandwidth
(config)#clock timezone|(config)#ntp server/master|(config)#sh ntp status to verify

Reroute when here is WAN congestion.

19. What is the bit rate for a G.729 call excluding layer 2?
Need to Know||Anytime you have an external call - it needs to match on a route pattern.
Ssh to the CUCM the phone is registered to|show perf query class 'Cisco MOH Device'
No POTS dial-peer or no direct-inward-dial on a pots dial-peer
8kb/s

20. How do you set up redundancy on outbound dial-peers on an H323 gateway?
#after-hours block pattern
#voice-class h323 1|#h225 timeout tcp establish 3 (if no response within 3 seconds continue dial-peer hunting)
(config)#ip domain-name <NAME>|(config)#isdn switch-type primary-ni|(config)#network-clock-participate wic 0||(config)#controller t1 0/0/0|(config-controller)#pri-group timeslots 1-3 - 24 service mgcp|(config-controller)#no shut||(config)#interface s
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.

21. If you're using Called/Calling Party Transformations at the Route Pattern - what happens if you do Digit manipulation at the route list?
The Called/Calling Transformations are superceded.
SIP Route Pattern over a SIP Trunk.
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.
No it invokes the RSVP call agent on the IOS Router via SCCP message. i.e. use a Software MTP.

22. What does the Transfer On-hook Enabled Service Parameter do?
'Service Parameters --> Auto Answer Timer
Allows you to transfer by only pressing the Transfer button once.
On CUCM it's identical to adding an H323 GW.
Gatekeeper| security acl answerarq 1||set up an access list permit whoever you want to allow

23. A show isdn status shows TEI_ASSIGNED. What do you do to get MULTIPLE_FRAME_ESTABLISHED?
Re-enter the mgcp bind control and mgcp bind media commands.
...
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

24. What are the commands to configure NTP in IOS?
(config)#clock timezone|(config)#ntp server/master|(config)#sh ntp status to verify
Dtmf-relay h245-alpha
1st the Subnet is recognized. (Device Mobility Info)|Then different Physical Locations are compared.
It's best to strip digits at the voice port.

25. How do you enable Extension Mobility for a device in CME?
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)
Assign a logout-profile to the ephone.
Call forwarding between voip to voip (when CUBE is in play)
SERVICE PARAMETER>|| Stop routing on unallocated number flag - Set to False|| Stop routing user busy - Set to False

26. In a SIP Dial Rule how do you represent a dialed * instead of it being used as a wildcard?

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27. What does Display-IE do?
Dtmf-relay h245-alpha
Sends the Calling Name.
CUCM - Partitions and Calling Search Spaces||CME - COR Lists
8kb/s

28. With the gw-priority command - does higher or lower priority take precedence?
Reroute when here is WAN congestion.
Higher
CUCM OS Administration Settings --> NTP Servers
Yes. The media resources in the first MRG listed will be used before media resources in the second MGR listed.

29. When using GK redundancy - what must you do to ensure both SUB and PUB use port 1720 for call-signalling.

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30. Where do you use VIA zone?
#voice class h323 1| #h225 timeout tcp establish 3||#dial-peer voice 3000 voip| #destination-pattern 3...| # voice-class h323 1| #session target ipv4:10.1.5.3 (sub)| #dtmf-relay h245-alpha||#dial-peer voice 30001 voip| #destination-pattern 3...| #pre

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
Ssh to the CUCM the phone is registered to|show perf query class 'Cisco MOH Device'

31. How do you see the details of calls coming in and out of the PRI?
Debug isdn q931
In milliseconds ... allows you to hang up cell phone then pick up at the desk phone without disconnecting the call.
Sends every digit to CUCM in real-time with digit-analysis being handled by CUCM.
Sh ccm-manager

32. What is a best practice for digit manipulation - in regards to H323 GWs?
Debug ephone moh
Push as much digit manipulation to the router as possible - so you can re-use it for SRST.
CUCM - Partitions and Calling Search Spaces||CME - COR Lists
Outbound dial-peers

33. When do you use translate called? Translate calling?
When multiple sites use the same route pattern - do your digit manipulation on a route list.
On CUCM -- UPTSAL||Create Your Users|Phone - set owner id|Create SIP Trunk|SIP Trunk Security Profile||Application Server|Licensing||||On CUPS||Work Left to right
Gatekeeper| security acl answerarq 1||set up an access list permit whoever you want to allow
Translate called - Calls going out to the PSTN||Translate Calling - Use on calls coming in from the PSTN. To change the ANI (Caller ID)

34. How do you block an external call from being transferred back out to the pstn by an internal user?
Apply voice-class codec
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
Debug isdn q931
Service Parameter --> Block OffNet To OffNet Transfer --> True

35. How do you configure phone ports on a 3750?
When I call in from off-net to a DID number in-net ... once authenticated - your calls appear to come from the desk phone.
Re-enter the mgcp bind control and mgcp bind media commands.
Access Port Method||interface range fa0/1 - 3|switchport voice vlan 20|switchport access vlan 10|spanning-tree portfast
When multiple sites use the same route pattern - do your digit manipulation on a route list.

36. When a CUCM device dials a number - what happens?
Single Number Reach (Mobile Connect)
Enterprise Parameters --> Organization Top Level Domain|Enterprise Parameters --> Cluster Fully Qualified Domain Name
(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
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 .)

37. When can you not use a Standard Local Route Group?
When configuring TEHO.
Service Parameters --> Mobile Voice Access Number
In the CUCM 7.0.1 Release Notes ... search for restore.
SERVICE PARAMETER>|| Stop routing on unallocated number flag - Set to False|| Stop routing user busy - Set to False

38. How do you enable AAR system wide?
CUCM Service Parameters --> Automated Alternate Routing Enable --> True
Telephony service|ip source-address 10.10.110.2|max-dn <NUM>|max-ephone <NUM>|create cnf-files
SERVICE PARAMETER>|| Stop routing on unallocated number flag - Set to False|| Stop routing user busy - Set to False
#voice class h323 1| #h225 timeout tcp establish 3||#dial-peer voice 3000 voip| #destination-pattern 3...| # voice-class h323 1| #session target ipv4:10.1.5.3 (sub)| #dtmf-relay h245-alpha||#dial-peer voice 30001 voip| #destination-pattern 3...| #pre

39. On an MGCP GW - how could you see the primary and backup CUCM servers?
voice translation-profile|and|voice translation-rule
Bandwidth
Show ccm-manager
Reroute when there is a WAN Outage.

40. How do you use an ephone template?
In CUCM on the PRI interface of the MGCP Gateway - set the Significant Digits to 4.
#call-manager-fallback|#ip source-address (IP)|#max-ephone 4|max-dn 8|Configure a refernce in CUCM
You need dial-peers and to allow h323 to h323 communication.||voice service voip| allow-connections h323 to h323
Apply it to the ephone.

41. Where can you find the command to restore any of the default IP Phone Services if they happen to have been deleted?
h225 timeout tcp establish 3 within a h323 voice class||#voice class h323 1|#h225 timeout tcp establish 3
When they are explicitly matched in a destination-pattern in a dial-peer.
In the CUCM 7.0.1 Release Notes ... search for restore.
Reroute when here is WAN congestion.

42. What command is needed on a gateway for it to invoke the DSP to convert multicast MOH stream to TDM?
You may be running into a CSA bug. Disable CSA in CUCM by:|SSH to CUCM|utils csa disable
CUCM Service Parameters --> Automated Alternate Routing Enable --> True
Yes. The media resources in the first MRG listed will be used before media resources in the second MGR listed.
Ccm-manager music-on-hold

43. How do you support multiple codecs on a dialpeer?
Enterprise Parameters --> Organization Top Level Domain|Enterprise Parameters --> Cluster Fully Qualified Domain Name
SIP Dial Rules
When I call in from off-net to a DID number in-net ... once authenticated - your calls appear to come from the desk phone.
Apply voice-class codec

44. What's the best way to perform digit manipulation on a route group?
#interface vlan 130 (voice vlan)| #h323-gateway voip interface| #h323-gateway voip id BR2 ipaddr 10.1.6.1| #h323-gateway voip h323-id UK| #h323-gateway voip bind srcaddr 10.1.130.1
Gatekeeper| security acl answerarq 1||set up an access list permit whoever you want to allow
...
Configure it on the route group through the route list - then it will be local to the route list.

45. SNR is also known as?
When I call in from off-net to a DID number in-net ... once authenticated - your calls appear to come from the desk phone.
Transfer to external is blocked by default.|To ensure only transfer to internal is allowed - make sure only the following tx pattern is under telephony-service||#telephony service| #transfer-pattern ....
CUCM Service Parameters --> Call Park Reversion Timer
Mobile Connect

46. On the RDP What is the Rerouting CSS used for?
(config)#voice register dialplan
Single Number Reach (Mobile Connect)
Debug ephone moh
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

47. What must you do for a BACD script to work on a CME router?
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
Enable MOH on the CME.||#telephony service|#moh music-on-hold.au
(config)#ip domain-name <NAME>|(config)#isdn switch-type primary-ni|(config)#network-clock-participate wic 0||(config)#controller t1 0/0/0|(config-controller)#pri-group timeslots 1-3 - 24 service mgcp|(config-controller)#no shut||(config)#interface s
CUCM - Partitions and Calling Search Spaces||CME - COR Lists

48. When you make a call and it results in a secondary dial-tone - What is this a symptom of?
(config)#isdn switch-type primary-net5|(config)#network-clock-participate wic 0||(config)#Controller e1 0/0/0|(config-controller)#pri-group timeslot 1-3 !!!Get the PRI up!!!|(config-controller)#no shut||(config)#int s0/0/0:15|(config-if)#isdn outgoin
No POTS dial-peer or no direct-inward-dial on a pots dial-peer
Device Pool Locations
Use IPs instead of hostnames for all CUCM servers.|ENTERPRISE PARAMETERS --> Replace all CUCM hostnames with IPs in URLs

49. How do you maintain 4-digit dialing to phones that are running in an SRST scenario (WAN outage)?

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50. How do you change modes in voice register global?
#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
Default is SRST||mode cme changes to CME|no mode cme changes back to SRST
Transfer to external is blocked by default.|To ensure only transfer to internal is allowed - make sure only the following tx pattern is under telephony-service||#telephony service| #transfer-pattern ....
Use IPs instead of hostnames for all CUCM servers.|ENTERPRISE PARAMETERS --> Replace all CUCM hostnames with IPs in URLs

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CCIE Voice Test

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