For which of the following would you not typically use the Cisco Unity Connection Alternate Extension field?

A.
for Unity Connection call-in convenience from a mobile phone

B.
to load balance callers between voice mailboxes

C.
to handle multiple line appearances on a single IP phone

D.
for Unity Connection call-in convenience from another IP phone

E.
to filter multiple lines to a single voice mailbox

Explanation:
You would not use the Cisco Unity Connection Alternate Extension field to load balance callers between voice
mailboxes. To load balance calls to Unity Connection, you would first need to ensure that Unity Connection is
integrated with Cisco Unified Communications Manager (UCM) by using the Skinny Client Control Protocol
(SCCP). In UCM Administration, you should then change the distribution algorithm to Longest Idle Time on the
Call Routing > Route/Hunt > Line Group page for the line group that answers calls on both the publisher server
and the subscriber server.
In Unity Connection Administration, you should then assign the first half of the answering ports, starting with the
lowest-numbered port, to the publisher server. The last half of the answering ports can then be assigned to the
subscriber server. You should then assign half the dial-out ports to the publisher server. The remainder of the
dial-out ports should be assigned to the subscriber server.
Alternatively, in UCM Administration, you could use the Top Down distribution algorithm for the line group that
contains ports that answer calls on each server in a Unity Connection cluster. In Unity Connection
Administration, assign the first half of the answering ports to the subscriber server. Assign the remainder of the
answering ports to the publisher server. This configuration ensures that the subscriber server will answer the
majority of the calls when the Top Down distribution algorithm is used. Next, assign the first half of the dial-outports to the publisher server so that the publisher server handles the majority of the message waiting indictors
(MWIs) and notifications. Assign the second half to the subscriber server.
The Alternate Extension field is typically used to enable a single voice mailbox to serve more than one directory
number (dn), or line. For example, up to nine administrator configured alternate extensions can be assigned to
a single voice mailbox. These alternate extensions can be individual dns from the voice virtual LAN (VLAN) or
the numbers of external devices. As a result, it is possible to enable a user to conveniently access Unity
Connection from a mobile phone or from another IP phone. Similarly, an Alternate Extension can be used to
access a single voice mailbox from multiple line appearances on a single IP phone.

Cisco: Cisco Unity Connection 10.x Clusters (Active/Active High Availability): Balancing the Load of Calls Unity
Connection Servers Handle
Cisco: Setting Up Features and Functionality Controlled by User Account Settings in Cisco Unity Connection
9.x: Alternate Extensions in Cisco Unity Connection 9.x