You administer a Cisco CME router with CUE installed. You issue the show running-config command on the
router and receive the following partial output:ephonedn 51
number 70…
mwi on
!
ephonedn 52
number 71…
mwi off
Which of the following statements are true? (Choose two.)
A.
When a caller dials 70123, the MWI light for extension 70123 will turn on.
B.
When a caller dials 70123, the MWI light for extension 123 will turn on.
C.
When a caller dials 71123, the MWI light for extension 71123 will turn off.
D.
The MWI lights cannot be turned on manually from an IP phone.
E.
When a caller leaves a message for extension 123, the MWI light for extension 123 will turn on.
Explanation:
When a caller dials 70123 or when a caller leaves a message for extension 123, the message waiting indicator
(MWI) light for extension 123 will turn on. The MWI light appears on a user’s IP phone when a new voice mail
message is received in the user’s Cisco Unity Express (CUE) voice mailbox.
To configure MWI, you must create two ephone-dns: one ephone-dn to turn the MWI light on when the user
receives a message, and one ephone-dn to turn the MWI light off when the user retrieves all of his or her
messages. When CUE receives a voice mail message for a user, CUE will send a code to the Cisco Unified
Communications Manager Express (CME) router to indicate that the user’s MWI light should be turned on.
When the user retrieves the message, CUE will send another code to CME to indicate that the user’s MWI light
should be turned off.
The MWI codes can be any number of any length as long as they are not the same as any existing extension
numbers. To configure the MWI code that CUE will send to CME, you should issue the number command with
the MWI code plus a number of periods equal to the number of digits in the users’ extensions. For example, if
you want to create MWI code 70 and your system is configured to use three-digit extensions, you should issue
the number 70… command in ephone-dn configuration mode.
Finally, the ephone-dn that is configured with the MWI code must also be configured with the mwi on or the mwi
off command, depending on whether the ephone-dn should be responsible for turning the MWI light on or off,
respectively. For example, the following command set configures ephone-dn 51 to turn on the MWI light for any
three-digit extension that is prefaced by the MWI code 70:
ephone-dn 51
number 70…
mwi on
Similarly, the following command set configures ephone-dn 52 to turn off the MWI light for any threedigit
extension that is prefaced by the MWI code 71:
ephone-dn 52
number 71…
mwi off
After CME receives a dialed string from CUE that contains the MWI code, CME will match the dialed digits to
the ephone-dn number pattern, strip off the explicitly matched MWI code, and change the state of the MWI light
for the extension that matches the remaining forwarded digits. In this scenario, CUE will send the digit string
70123 to CME when the user at extension 123 receives a voice mail message? CME will then strip off MWIcode 70 and turn on the MWI light for extension 123.
The MWI light on an IP phone can be turned on or off manually if a user dials the MWI code plus any extension
number, provided that the MWI code can be dialed on an IP phone keypad. For example, if a user dials 70123
from the keypad of an IP phone connected to a CME router that is configured with the command sets shown
above, the MWI light will turn on for the IP phone that has been assigned extension 123, even though extension
123 has not received a new voice mail message.
To prevent users from being able to turn the MWI light on or off at will without having to leave or listen to a
voice mail message, you can configure the MWI code by using a character from A through D in the digits. The
characters ranging from A through D are included in the dual-tone multi-frequency (DTMF) signaling standard
but are not included on typical telephone keypads. For example, the following command set configures ephonedn 51 to turn on the MWI light for any three-digit extension that is prefaced by the MWI code A7:
ephone-dn 51
number A7…
mwi on
The MWI light for extension 70123 will not turn on when a caller dials 70123. The ephone-dns in this scenario
are configured to turn the MWI light on or off for IP phones with three-digit extensions. Extension 70123 is a
five-digit extension. Therefore, the MWI light for extension 70123 will not turn onÍž the MWI light for extension
123 will turn on, even if extension 123 has not received a new voice mail message.
Similarly, the MWI light for extension 71123 will not turn off when a caller dials 71123. The ephone-dns in this
scenario are configured to turn the MWI light on or off for IP phones with three-digit extensions. Extension
71123 is a five-digit extension. Therefore, the MWI light for extension 71123 will not turn off? the MWI light for
extension 123 will turn off, even if extension 123 contains new voice mail messages.Cisco: Troubleshooting Unity Express Message Waiting Indication (MWI) Problems: MWI with Cisco
CallManager Express
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