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?

DRAG DROP
Click the matching criteria for inbound POTS call on the left and drag them to the order of selection on the right.

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?

A company has migrated to a Cisco Unified CallManager IP Telephony system and is now
replacing the existing voice-mail system with a Cisco Unity voice-mail system. A small group of
users has been established to test the new voice mail system. The users were able to initialize
their mailboxes and record greetings; however, during testing the callers were sometimes unable
to leave voice-mail messages for Cisco Unity users.
Which two issues could cause this problem? (Choose two.)

Which Cisco Unity troubleshooting tool would be used to diagnose problems with skinny and MWI
messages?