ViewMail for Outlook uses Distributed Component Object Model (DCOM) to
communicate with the Cisco Unity server and in some scenarios, a DCOM call to
the server will fail. No audio is heard when Cisco Unity plays voice mail over
the phone by using ViewMail. This symptom has only been reported on Windows
This document describes the workarounds to correct this problem.
Technical Tips Conventions for more information on document
There are no specific prerequisites for this document.
The information in this document is based on all versions of Cisco
Unity for Exchange.
The information presented in this document was created from devices in
a specific lab environment. All of the devices used in this document started
with a cleared (default) configuration. If you are working in a live network,
ensure that you understand the potential impact of any command before using
No audio is heard when Cisco Unity plays voice mail over the phone by
using ViewMail. This symptom has only been reported on Windows 95/98.
The solutions to this problem are explained in detail below. While we
do not know the root cause of this problem, the following two workarounds will
correct the problem.
Install the latest version of ViewMail for Outlook. It is included with
the CD image of the latest version of Cisco Unity, which you can download from
From the Windows 95/98 desktop, perform the following
Right-click the Network Neighborhood icon.
Click Properties > Access
Choose Share-Level Access
VMO can be updated independent of the Cisco Unity version. It is
recommended to have the latest VMO version installed. See the
Unity Release Notes for information on compatible Unity and VMO
The silence of voice messages through the VMO during playback can also
occur if the the Microsoft Exchange server has upgraded or moved to a different
partner exchange server. If the partner server is upgraded, make sure that the
Microsoft Exchange System Manager on the Cisco Unity
server is also upgraded. Then, rerun the Message Store Configuration Wizard
(MSCW) and point it to the new/upgraded partner exchange server.
Note: The Microsoft Exchange System Manager provides
the Messaging Application Programming Interface (MAPI) subsystem that Cisco
Unity requires in order to communicate with Microsoft Exchange.
When you use VMO to play voicemail on the IP phones, the voicemail
takes at least 5 to 50 seconds to start playing.
In order to resolve this issue, verify these items:
The HOSTS and LMHOSTS files are properly updated in the cluster, or
you can have a DNS server configured with the host name and IP address of the
server so that the server name is resolved properly. Refer to
DNS Troubleshooting for Cisco Unity Servers for more information.
There is no NIC teaming enabled on Unity