You have received a trouble ticket stating that users in accounting are not able to use the CFwdAll
softkey to forward their calls to voice mail. Their phones continue to ring when they receive
inbound calls, even after they have pressed the CFwdAll softkey and the Messages button. What
is a possible cause of this issue?

You have placed all DNs in the Phones partition. During testing you discover that you cannot place
calls between IP phones, but you can place calls to the PSTN and voice mail. What is one
possible cause of this issue?

You have received a trouble ticket stating that the MWI light is not coming on for a group of users.
Further investigation reveals that the affected users are connected to the same subscriber in the
cluster. Users that are connected to other subscribers in the same cluster are not experiencing this
issue.
What is causing this problem?

How does the echo canceller interpret a signal when the ERL value is too low?

Three calls can successfully be made across a WAN link. When a fourth call is made, the quality
of all four calls degrades. Which QoS mechanism can help avoid this problem?

Cisco CallManager 5.0 has just been deployed in two locations across a wide-area link. A
distributed model with an intercluster trunk has been used. When you call an IP phone at the
remote site the phone rings, but as soon as the other person picks up the phone, the call is
dropped.
Where should you look to diagnose the problem?

What are the two most common causes of echo? (Choose two.)

Echo is always present to some extent in all voice networks. For echo to be a problem, which
three conditions must exist? (Choose three.)

Refer to the exhibit.

You have received a trouble ticket stating that calls to international numbers
are failing. To place an international call, users dial the access code “9,” followed by “011,” the
country code, and the destination number. After entering the debug isdn q931 command on the
MGCP gateway, you have the user attempt the call again.

Based on the debug output, what is the most likely cause of this problem?

You have received a trouble ticket from John Doe at extension 2001, which states that he cannot
call a new employee who has been assigned extension 2005. When John Doe attempts to call
2005 he hears a message that his call cannot be completed as dialed. What is one possible cause
of this issue?