Cisco ICS 7700 Series Integrated Communication Systems

Field Notice: Cisco Unity Playback Speed Controls May Drop Callers or Lock Up All Unity Ports

March 7, 2002

Products Affected

  • Cisco Unity IP and IP/PBX 3.1(2)

Problem Description

The use of playback speed controls during message retrieval results in various symptoms based on system configuration. Cisco Unity may drop the call immediately, disable the port after the call has ended, or not answer calls to any of the Unity ports.


This symptom can be observed in Cisco Unity version 3.1(X) only while using the speed control feature available during message playback. This feature uses speed control key 4 to slow down and key 6 to speed up messages played by Cisco Unity.

Problem Symptoms

The symptoms vary based on the system configuration. All Cisco Unity ports lock up and Unity stops call response, or Unity drops calls, when a caller attempts to use the speed control keys.

This matrix explains the behavior when you use speed control on messages of type G711 and G729, respectively. Speed control is used while messages are played back. The messages can either be stored in 711 or 729 (with use of the set record format utility), and the network can be either 711 or 729 (based on the Cisco CallManager region). This leads to four possible scenarios:


Source (Cisco Unity)

Destination (IP Phone)





The call is dropped. No ports are locked.




The call is dropped only under fast, simultaneous key presses (4 and 6).




All ports are locked. Subsequent calls to Cisco Unity fail on all ports.




The call is dropped only under fast, simultaneous key presses (4 and 6).

If the Cisco Unity system hits case 3, all calls that follow to the Unity system fail and the system remains fully disabled until restarted. Cisco Unity ports continue to remain registered with Cisco CallManager for the entire period, and CallManager continues to route calls to Unity with ring no answer.


Do not use the speed control feature in Cisco Unity version 3.1.x.

A hotfix to disable speed control can be installed, as this section describes.

Note:?A hot fix to disable the speed control feature is not available for Cisco Unity 3.1(1); you must download Unity 3.1(2) or 3.1(2b) and apply the hot fix.

Before you begin, verify that your system has Cisco Unity 3.1(2.0) installed by doing these steps:

  1. In the Cisco Unity Administrator, choose System > Configuration > Software Versions.

    The Cisco Unity version number is displayed in the Unity Version field. Or you can check the version from the Cisco Unity installation directory \CommServer.

  2. Right-click on the file AvCsMgr.exe and choose Properties.

  3. In the AVCsMgr.exe properties dialog box, click the Version tab.

  4. Under Other Version Information, in the Item Name list, click Product Version.

By performing these steps, Cisco Unity 3.1(2) or Unity 3.1(2b) has the speed control feature disabled:

  1. Download the hot fix file AvMiuTapiLineSvr.dll from

    1. With a Netscape or Internet Explorer web browser, open the Special File Access URL.

    2. At the Special Access Code prompt, enter OIFSUVAW.

    3. Click on the Submit button.

      This brings you to a web page that lists your files for pickup.

    4. Select AvMiuTapiLineSvr.dll.

      This takes you to the Software License Agreement web page.

    5. Click Accept, and then click AvMiuTapiLineSvr.dll to download the file to your local disk.

  2. Stop Cisco Unity.

  3. On the Cisco Unity server, go to the CommServer\Components directory, and back up the AvMiuTapiLineSvr.dll file, naming it AvMiuTapiLineSvr.old.

  4. Copy the new AvMiuTapiLineSvr.dll file that you downloaded in Step 1 to the CommServer\Components directory.

  5. At a command prompt, go to the CommServer\Components directory, and enter regsvr32 AvMiuTapiLineSvr.dll to register the new DLL with Windows.

  6. Restart the Cisco Unity server.

    Note:?The Special Access Code OIFSUVAW expires on March 13, 2002. Either a more permanent solution is available on the Software Center download page, or this Field Notice will be updated with a new Special Access Code.


To follow the bug ID link below and see detailed bug information, you must be a registered user and you must be logged in.




Cisco Unity Playback speed controls in G729 call locks up Unity ports.

For More Information

If you require further assistance, or if you have any further questions regarding this field notice, please contact the Cisco Systems Technical Assistance Center (TAC) by one of the following methods:

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