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CCNA Voice

Terms

undefined, object
copy deck
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

Deck Info

107

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