CCNA Voice
Terms
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- Supervisory Signals
- on-hook, off-hook, ringing
- Addressing Signals
- DTMF, Pulse
- What is the first step of the digital voice conversion process?
- Sample
- What is the second step of the digital voice conversion process?
- Quantize
- What is the third step of the digital voice conversion process?
- Encode
- What is the fourth step of the digital voice conversion process?
- Compress
- What process is used to sample an analog voice signal?
- PAM (pulse amplitude modulation)
- What process is used to encode an analog voice signal?
- PCM (pulse code modulation)
- What digital voice encoding is used in the US and Japan?
- mu-law
- What voice encoding standard is used throughout the world except the US and Japan?
- A-law
- What range of frequencies does PAM sample?
- 300 Hz - 4000 Hz
- How many samples per second are taken in normal voice sampling?
- 8000
- How many bits are used to encode each sample in voice sampling?
- 8
- What bandwidth is required for a voice grade channel?
- 64 kbps
- What technology allows multiple calls to be transmitted over a single digital line by interleaving different calls into timeslots?
- TDM (time division multiplexing)
- What signaling method uses bits from within the transmitted voice?
- Channel Associated Signaling
- What signaling uses a dedicated channel to transmit control information?
- Common channel signaling
- What timeslot is used by a T1 for control information in CCS?
- 24
- When using robbed bit signaling, which bit of a T1 is "robbed" to transmit control information?
- Eighth bit of every sixth frame
- How many DS0s are contained in a T1 channel?
- 24
- How many DS0s are contained in an E1 channel?
- 32
- Which timeslot is used to carry E1 control information?
- 17
- How many bits are sent per frame in a T1 channel?
- 193
- How many bits are sent per frame in an E1 channel?
- 256
- What are the three types of signaling that can be used with T1/E1 CAS?
- Loop start, ground start and E&M
- Which E&M method is *not* supported by Cisco?
- Type 4
- What signaling protocol is usually used for T1 subscribers?
- Q.931 (ISDN)
- What is the ITU standard for numbering plans?
- E.164
- What are the three parts of an E.164 numbering plan?
- Country code, National Destination Code, Subscriber Number
- What are the four layers of the Cisco VoIP architecture?
- Endpoints, Applications, Call Processing, Infrastructure
- What are the four Cisco call processing products?
- UC500, Call Manager Express (CME), Unified Communications Manager Business Edition, Unified Communications Manager
- What is the maximum number of users for a UC500 system?
- 48
- What is the maximum number of users for a CME system?
- 250
- What is the maximum number of users for CUCM-BE?
- 500
- What platform does the CME run on?
- Cisco Integrated Services Router
- What platform does CUCM-BE and CUCM run on?
- Cisco 7835 Convergence Media server
- What are Cisco's three unified messaging products?
- Cisco Unity Express, Cisco Unity Connection, Cisco Unity
- What is the maximum number of users for Cisco Unity Express?
- 250
- What is the maximum number of users for Cisco Unity Connection?
- 7500
- What three methods can be used to power Cisco phones?
- Catalyst Power over Ethernet, Patch Panel Power over Ethernet, Cisco Power Brick (wall power)
- What two methods can Catalyst switches use to provide Power over Ethernet?
- Cisco Inline Power, 802.3af
- What protocols does Cisco Inline Power use to discover devices?
- Fast Link Pulse
- What is the maximum wattage 802.3af can provide?
- 15.4 W
- In a VLAN environment, what command is used on a router to allows devices on one VLAN to get their IP address from a DHCP server on the other?
- Subinterface command; ip helper-address
- What is the first step of the Cisco IP phone boot process?
- Power on
- What is the second step of the Cisco IP phone boot process?
- Catalyst sends Voice VLAN information via CDP
- What is the third step of the Cisco IP phone boot process?
- The phone sends a DHCP request to get an IP address
- What is the fourth step of the Cisco IP phone boot process?
- The phone gets an IP address, as well as the address of a TFTP server
- What DHCP option defines the TFTP address a Cisco IP phone should use to get its configuration?
- 150
- What is the fifth step of the Cisco IP phone boot process?
- The phone contacts the TFTP server to get its configuration file
- What is the sixth step of the Cisco IP phone boot process?
- The phone registers with one of the call processing agents in its configuration file
- What command is used to define the addresses to exclude from the DHCP pool?
- Global config; ip dhcp excluded-address
- What command is used to configure the DHCP address pool on a router?
-
Global config; ip dhcp pool
- What command configures the pool of DHCP addresses for a pool?
-
DHCP config mode; network
- What command is used to configure the default gateway for the router DHCP service?
-
DHCP config mode; default-gateway
- What command is used to configure the DNS server for the router DHCP service?
-
DHCP config mode; dns-server
- What command is used to configure the TFTP server for the router DHCP service?
-
DHCP config mode;
option 150 ip
- How does one set a time server on a Cisco router?
-
Config mode;
ntp server
- What three licenses are required to set up a CME system?
- IOS license, feature licenses, phone user licenses
- What command copies the CME binary to a router?
-
Privilege mode;
copy tftp://
/file flash: - What command does one use to extract and install a CME bundle?
-
Privilege mode;
archive tar /xtract tftp://
/ flash: - In what directory are IP phone firmware files installed in a default configuration?
- flash:/phone
- What command does one use to set up a router as a TFTP server?
-
Config mode;
tftp-server flash:/
/ alias - What command enters telephony configuration mode?
- Config mode; telephony-service
- What command defines the maximum number of phones allowed?
- Telephony conf mode; max-ephones #
- What command defines the maximum number of directory numbers allowed?
- Telephony conf mode; max-dn #
- What command defines which binary file will be delivered when a phone requests firmware?
-
Telephony conf mode;
load
. Note that this file is the TFTP alias name. - What command configures the IP address of the CME service?
-
Telephony conf mode;
ip source-address
- What is the best practice for defining the IP address used for the CME service?
- Create a dedicated loopback address using the interface loopback # command in global config mode.
- What command will create phone configuration files?
- Telephony conf mode; create cnf-files
- What is the name of the default config file?
- XML.Default.cnf
- What command is used to configure the data VLAN on a switch interface?
-
Interface conf mode;
switchport mode access
- What command is used to configure the voice VLAN on a switch interface?
-
Interface conf mode;
switchport mode voice
- What command is used to create a single-line directory number?
-
Telephony config mode;
ephone-dn
- What command is used to create a dual-line directory number?
-
Telephony config mode;
ephone-dn
dual-line - What command is used to assign an extension to a DN?
-
DN config mode;
number
- What command is used to assign a DID (dial-in direct) number to a DN?
-
DN config mode;
number
secondary - What command is used to create an ephone?
-
Telephony config mode;
ephone
- What datum is required to associate a configured ephone with a physical IP phone?
- MAC address
- How is the MAC address associated with an ephone entered?
-
Ephone config mode;
mac-address
- What command can be used to verify the registration status of a Cisco IP phone?
- Privileged mode; show ephone
- How does one assign a DN to a button on an ephone?
-
Ephone config mode;
button <#>:
- What command can be used to "soft" reboot a Cisco IP phone?
- Ephone config mode; restart *or* in config mode; restart all
- What changes in an ephone config can be registered with the restart command?
- phone line and speed dial changes
- What feature is configured with the "button 1b2" command?
- DN 2 is assigned to button 1 on this ephone. When DN 2 rings, it will flash on the phone, but not ring. There will be a call waiting beep.
- What feature is configured with the "button 1f2" command?
- DN 2 is assigned to button 1 on this phone with a "feature ring", i.e., triple ring.
- What feature is configured with the "button 3m5" command?
- The display for button 3 shows the status of DN 5, but it cannot be used to make or receive calls.
- What feature is configured with the "button 2o7,8" command?
- Both DNs 7 and 8 are assigned to button 2 on this phone. There will be no call waiting between the two lines.
- What feature is configured with the "button 2c7,8" command?
- Both DNs 7 and 8 are assigned to button 2 on this phone. If one line rings while the other is off-hook, there will be a call waiting notification.
- What feature is configured with the "button 2x1" command?
- Allows button 2 to serve as an overflow for button 1.
- What feature is configured with the "button 4s15" command?
- Assigns DN 15 to button 4, but silently, with no notifications.
- How does one configure a line to be shared?
- Preferred way: Create two DNs assigned to the same extension. This allows both phones to make outgoing calls simultaneously. Another way: simply assign the DN id to buttons on multiple separate phones.
- Barring other measures, if an extension is assign to two DNs with the same extension, when a call is made to that extension, what will happen?
- Pick a DN at random to ring.
- Assume two DNs with the same extension. What command can be used to select the order in which DNs are rung when an incoming call is received?
- Ephone-dn conf mode; preference #. Note: 0 is the most preferred, 9 least.
- Assume two dual-line DNs with the same extension. Barring other measures, what will happen if a call is received when one DN has a call on that extension?
- Assuming the phone on the call has a lower preference, the call will go to its voicemail, not to the other line.
- Assume a shared line scenario. What command can force a dual-line DN to not roll into voicemail if a call is received while busy?
- DN config mode; huntstop channel. If you want the call to attempt to match other DNs, use the no huntstop command.
- What command is used on a router to diagnose TFTP issues?
- Privileged mode; debug tftp events
- What command is used to show which binaries are bound to which phone models with the "load" telephony-service config command?
- show telephony-service tftp-bindings
- What command shows information on phone registrations?
- Privileged mode; debug ephone register
- What is auto-registration?
- It allows new phones to register their MAC addresses with the CME. The phone is not assigned any config, but the address is recorded.
- What command displays phone registrations?
- show ephone attempted-registrations
- How can one configure auto-registration to allow config assignment, i.e., so the phones work?
-
Telephony conf mode;
auto assign
type - What changes require a "reset" of a phone?
- DHCP scope changes, Date and time changes, Firmware changes, Locale changes, Button URL changes, Voicemail number changes
- What command can be used to define a user locale, i.e., language support?
-
Telephony conf mode;
user-locale
- How can one create an ephone template?
-
Config mode;
ephone-template
. To assign to a phone, config mode; ephone ephone-template - How does one add a banner at the bottom of each display?
-
Telephony conf mode;
system message
- How does one change the date and time format?
- Telephony conf mode; time-format, date-format