This document describes how to resolve the issue when parked calls are
dropped across WAN in Cisco Unified Communication Manager 5.x.
Cisco recommends that you have knowledge of these topics:
The information in this document is based on these software and
The information in this document was created from the devices in a
specific lab environment. All of the devices used in this document started with
a cleared (default) configuration. If your network is live, make sure that you
understand the potential impact of any command.
Technical Tips Conventions for more information on document
The Call Park feature allows you to place a call on hold, so it can be
retrieved from another phone in the Cisco Unified Communication Manager system,
such as a phone in another office or in a conference room. If you are on an
active call at your phone, you can press the Park softkey or the Call Park
button in order to park the call to a call park extension. Someone on another
phone in your system can then dial the call park extension to retrieve the
In Cisco Unified Communication Manager 5.x, if a call is parked, when
you go back to retrieve that call, the call is gone or a fast busy is heard.
This happens when calls are parked to phones that are connected remotely
through MGCP gateways.
Note: This issue can also occur if there is a firewall in the
Note: Each Cisco Unified Communication Manager to which devices are
registered needs its own unique call park directory number and range.
In order to solve the call park issue, complete these
Log into the Cisco Unified Communication Manager Administration
page. Choose System > Service
Select the Cisco Unified Communication Manager to which the phones
are registered, and choose Callmanager service from the
services drop-down list.
Find the Disable Alerting Progress Indicator
parameter under the Clusterwide Parameters (Device - PRI and MGCP
Change the parameter value from False to
True, and click the Save icon. The default
value is false.