You are the administrator for your company’s UCM network. Examine the exhibit below, and answer the
question:
Which of the following is most likely the reason that Cisco Jabber cannot connect to the user’s desk phone?
A.
The Cisco Unity Connection server is not running.
B.
A workstation firewall is preventing Cisco Jabber from connecting to the IP phone.
C.
The UCM Allow Control of Device from CTI check box cannot be selected for the user’s IP phone.
D.
UCM is not running.
Explanation:
Of the choices provided, the problem is most likely that a workstation firewall is preventing Cisco Jabber from
connecting to the IP phone. Cisco Jabber relies on User Datagram Protocol (UDP) to communicate with an IP
phone. If UDP traffic to the IP phone is blocked or denied by a firewall that is installed on the same workstation
as Cisco Jabber, the Cisco Jabber client and the IP phone will not be able to communicate.
Most likely, the Cisco Unified Communications Manager (UCM) Allow Control of Device from CTI check box
can be selected for the user’s IP phone. To enable a user to control an IP phone by using Cisco Jabber, you
should complete the following steps:
1.Click Device > Phone in UCM.
2. Find the IP phone that you want to configure, or add a new IP phone.
3. Edit the Device Information section for the IP phone you want to configure.
4. Select the Allow Control of Device from CTI check box.
5. Associate the IP phone with a directory number (dn), if it is not already.
UCM displays the Allow Control of Device from CTI check box only if the model of the IP phone that you add or
edit is supported. In this scenario, the Allow Control of Device from CTI check box is available for selection and
has already been selected.
Most likely, the UCM server is running. If UCM were not running, you would not be able to access the UCM
Administration page that is displayed in this scenario. However, Cisco Unity Connection might not be running,
because the Cisco Jabber client is not able to connect to it. Cisco Unity Connection’s state would not prevent
Cisco Jabber from communicating with the IP phone.Cisco: Jabber Cannot Control DeskPhone