Troubleshooting Guide for Cisco Unity Release 8.x (With Microsoft Exchange)
Troubleshooting Audio Quality in Cisco Unity 8.x
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Troubleshooting Audio Quality in Cisco Unity 8.x

Table Of Contents

Troubleshooting Audio Quality in Cisco Unity 8.x

Overview of Audio Quality Problems in Cisco Unity 8.x

Common Symptoms of Audio Quality Problems in Cisco Unity 8.x

Setting the Volume Level of Greetings and Recorded Names in Cisco Unity 8x

Setting the Speed Level of System Prompts in Cisco Unity 8.x

Setting the Speed Level for Subscriber Messages in Cisco Unity 8.x

Advanced Audio Quality Troubleshooting in Cisco Unity 8.x

Wave Gain for Recording and Playback in Cisco Unity 8.x

Automatic Gain Control in Cisco Unity 8.x

Comfort Noise in Cisco Unity 8.x

Audio Troubleshooting Utilities in Cisco Unity 8.x

CAP Ripper

RTP Parser


Troubleshooting Audio Quality in Cisco Unity 8.x


Overview of Audio Quality Problems in Cisco Unity 8.x

Audio quality problems can manifest themselves in a variety of ways, and can be difficult to diagnose and correct. For example, subscribers may report volume differences between messages and system prompts, or report that messages are distorted. Audio quality symptoms may not be present for every subscriber, or may not consistently appear for every message or system prompt.

The entire device topology can affect audio quality, both within and outside of the control of Cisco Unity. Cisco Unity-controlled features include automatic gain control (AGC), wave gain (the boost or reduction of audio levels by the WAV driver), and the audio codec chosen for message storage. Cisco Unified Communications Manager controls the region setting for the audio codec. Finally, the Cisco gateway gain and attenuation settings can also affect audio quality.

See the following sections:

Common Symptoms of Audio Quality Problems in Cisco Unity 8.x

Setting the Volume Level of Greetings and Recorded Names in Cisco Unity 8x

Setting the Speed Level of System Prompts in Cisco Unity 8.x

Setting the Speed Level for Subscriber Messages in Cisco Unity 8.x

Advanced Audio Quality Troubleshooting in Cisco Unity 8.x

Wave Gain for Recording and Playback in Cisco Unity 8.x

Automatic Gain Control in Cisco Unity 8.x

Comfort Noise in Cisco Unity 8.x

Audio Troubleshooting Utilities in Cisco Unity 8.x

Common Symptoms of Audio Quality Problems in Cisco Unity 8.x

The most common symptoms of audio quality problems in Cisco Unity are:

The volume of greetings and voice names is higher or lower than the volume of Cisco Unity system prompts.

The speed of Cisco Unity system prompts, messages, voice names, and greetings is too slow or too fast for some subscribers.

The speed at which Cisco Unity plays menus, voice names, greetings, and messages is inconsistent.

Audio is broken up during message playback.

See Table 7-1 for basic corrective action.

Table 7-1 Basic Audio Quality Troubleshooting for Cisco Unity 

Symptom
General Circumstances in Which Symptom Occurs
Correction Actions

The volume of greetings and voice names is higher or lower than the volume of Cisco Unity system prompts.

The problem may affect only certain greetings and voice names.

The problem may occur only after an upgrade.

1. Confirm that the wave gain playback and record settings are both set to 0.

2. Run the Set Volume Level utility to bring pre-upgrade greetings and voice names to the correct dB levels.

3. Check and adjust the Cisco Unity AGC settings, if necessary (set to -26 dB default value).

4. Check and adjust the wave gain playback setting, if necessary.

For detailed instructions, see the "Setting the Volume Level of Greetings and Recorded Names in Cisco Unity 8x" section.

The speed of Cisco Unity system prompts, messages, voice names, and greetings is too slow or too fast for some subscribers.

Some subscribers may want or need Cisco Unity to play menus and messages at a different rate than other subscribers prefer.

Adjust the speed of system prompts for individual subscribers, or tell them how to do it themselves. Subscribers can adjust the speed for message playback themselves.

For details, see the "Setting the Speed Level of System Prompts in Cisco Unity 8.x" section and the "Setting the Speed Level for Subscriber Messages in Cisco Unity 8.x" section.

The speed at which Cisco Unity plays menus, voice names, greetings, and messages is inconsistent.

For example, subscribers may report that when they listen to a message, it is played at a different speed than the voice name of the subscriber who left the message, and the message properties (such as the timestamp and message number).

Such inconsistencies are expected. Consider the following:

Cisco Unity plays recorded voice names and greetings at the speed at which they were recorded. Neither you nor subscribers can change the playback speed of voice names and greetings.

The speed that you or a subscriber specifies for system prompts—the standard recordings that come with the Cisco Unity system, including prompts for message properties—does not affect the playback speed used for messages.

The speed that subscribers specify for message playback does not affect system prompts.

Adjust the system prompt and message speed so that they are similar. You can adjust the speed of system prompts for all subscribers or for a single individual. Subscribers can adjust the speed for system prompts and messages themselves.

For details, see the "Setting the Speed Level of System Prompts in Cisco Unity 8.x" section and the "Setting the Speed Level for Subscriber Messages in Cisco Unity 8.x" section.

When subscribers listen to messages, the audio stream is broken up.

Subscribers have the Media Master set to use their computer speakers as the preferred playback device and they are working with Cisco Unity ViewMail for Microsoft Outlook and/or the Cisco Unity Inbox in a low-bandwidth environment (for example, in a branch office).

As applicable, set up ViewMail for Outlook and/or the Cisco Unity Inbox to download messages before playing them.

For details, see the "Customizing ViewMail for Optimal Performance" and the "Customizing Cisco Unity Inbox for Low Bandwidth Deployments" sections in the "Setting Up Subscriber Workstations in Cisco Unity 8.x" chapter of the System Administration Guide for Cisco Unity Release 8.x. The guide is available at http://www.cisco.com/en/US/docs/voice_ip_comm/unity/8x/administration/guide/8xcusagx.html.


Setting the Volume Level of Greetings and Recorded Names in Cisco Unity 8x

The Set Volume Level utility allows you to level all WAV files on the Cisco Unity server to the same value, and to adjust the playback level, if needed.

Because automatic gain control (AGC) is enabled by default, after an upgrade you may experience a problem in which the existing greeting and name recordings sound louder than new greetings and names recorded after the upgrade.

The Cisco Unity registry setting AGCminimumThreshold controls the minimum dB level of an incoming recording that Cisco Unity attempts to adjust. The setting prevents both silence in a message and background hiss from being adjusted. The AGCminimumThreshold has a default setting of -45 dB and an allowable range of -35 dB to -55 dB.

The following procedure levels all WAV files on the Cisco Unity server to the same value, and provides instructions for adjusting the playback level, if necessary.


Note For Cisco Unity failover, registry changes on one Cisco Unity server must be made manually on the other Cisco Unity server in the failover pair, because registry changes are not replicated.


To Adjust Greeting and Name Recordings by Using the Set Volume Utility


Step 1 On the Cisco Unity server desktop, double-click the Cisco Unity Tools Depot icon.

Step 2 If you do not have a Cisco Unified Communications Manager integration, skip to Step 8.

If you have a Cisco Unified CM integration, and the Cisco Unified CM region is set to use the G.711 codec, in the left pane, under Administration Tools, double-click Advanced Settings Tool.

Step 3 In the left pane of the Unity Advanced Settings window, click Audio - Set WaveGain dB Adjustment Value for Playback.

Step 4 In the right pane of the Unity Advanced Settings window, confirm that the Current Value field is set to 0.

Step 5 In the left pane of the Unity Advanced Settings window, click Audio - Set WaveGain dB Adjustment Value for Recordings.

Step 6 In the right pane of the Unity Advanced Settings window, confirm that the Current Value field is set to 0.

Step 7 Click Exit.

Step 8 In the left pane of the Tools Depot window, browse to Audio Management Tools, and double-click Set Volume.

Step 9 Under Select Greetings and Voice Names to Adjust, click Select All.

Step 10 Confirm that the Save Original Files To check box is checked, then enter the location to which the backup copy of the original recorded names and greetings files will be saved.

Step 11 Under Options, verify that the values match those shown in the following table.

New Target dB Level

-26

Sample Size

8000

Max dB Adjustment

5

Min dB Threshold

-45


Step 12 Confirm that the Save Above Volume Options check box is checked. Note that setting New Target dB Level to a value other than zero turns on automatic gain control.

Step 13 Click Set Volume Level.

Step 14 When "Done" appears in the Set Volume Level window, all existing greeting and name recordings have been adjusted to the setting in the New Target dB Level field. Click OK, and then click Exit.

Step 15 If you do not have a Cisco Unified CM integration, you have completed all necessary steps in this procedure.

If you have a Cisco Unified CM integration, and the Cisco Unified CM region is set to use the G.711 codec, start the Cisco Unity Administrator.

Step 16 Go to any page in the Cisco Unity Administrator that contains the Media Master, and verify that the phone is selected as the playback device.


Note In order to use the phone as a recording and playback device, Cisco Unity must have at least one port assigned for a TRAP Connection per session on the System > Ports page. See the "Voice Messaging Port Settings in Cisco Unity 8.x" section in the "Managing Systemwide Settings in Cisco Unity 8.x" chapter of the System Administration Guide for Cisco Unity Release 8.x for more information. The guide is available at http://www.cisco.com/en/US/docs/voice_ip_comm/unity/8x/administration/guide/8xcusagx.html.


Step 17 Click Play on the Media Master to listen to a recording (for example, a subscriber greeting) over the phone.

If the volume of the recording is acceptable, you have completed all necessary steps in this procedure.

If the volume of the recording is too quiet, continue with Step 18.

Step 18 In the left pane of the Tools Depot window, under Audio Management Tools, double-click Advanced Settings Tool.

Step 19 In the left pane of the Unity Advanced Settings window, click Audio - Set WaveGain dB Adjustment Value for Playback.

Step 20 In the right pane of the Unity Advanced Settings window, increase the value of the Current Value field by one or two dB and click Set.

Step 21 Listen to the volume of a recording.

If the volume of the recording is acceptable, note the setting of the Current Value field and continue with Step 22.

If the volume of the recording is still too quiet, repeat Step 20 and Step 21.

Step 22 Click Exit.

Step 23 If the Cisco Unity system is configured for failover, repeat Step 1 through Step 22 on the secondary server in the failover pair.


Setting the Speed Level of System Prompts in Cisco Unity 8.x

You can specify system prompt speeds for each subscriber on the applicable Conversation page for a subscriber template or for an individual subscriber in the Cisco Unity Administrator, or by using the Bulk Edit utility. The speed that you specify here affects the speed of recorded voice names, prompts and phone menus, message headers and footers, and subscriber greetings.

In addition, subscribers can use the Cisco Unity Assistant to adjust prompt speed themselves. Refer subscribers to the "Working with the Media Master" chapter of the User Guide for the Cisco Unity Assistant Web Tool, available at http://www.cisco.com/en/US/products/sw/voicesw/ps2237/products_user_guide_list.html.

Setting the Speed Level for Subscriber Messages in Cisco Unity 8.x

You can specify message playback speed for each subscriber on the applicable Conversation page for a subscriber template or for an individual subscriber in the Cisco Unity Administrator, or by using the Bulk Edit utility.

Subscribers can adjust the settings themselves on the Phone Menu Preferences page in the Cisco Unity Assistant.

On a per-message basis, subscribers can also adjust the playback speed of their messages by phone or from a Media Master. (Not all phone system integrations support speed control by phone.)

Instructions for adjusting the playback speed of messages can be found in the "Changing Recording and Playback Settings" chapter in the User Guide for the Cisco Unity Phone Interface. The guide is available at http://www.cisco.com/en/US/products/sw/voicesw/ps2237/products_user_guide_list.html.

Advanced Audio Quality Troubleshooting in Cisco Unity 8.x

See Table 7-2 for advanced corrective actions and links to other troubleshooting procedures and information for the following symptoms:

Messages and/or Cisco Unity system prompts sound distorted.

A hissing sound is heard when there is no audio from Cisco Unity.

Message playback volume is higher or lower than the volume of Cisco Unity system prompts, in certain cases.

TTY characters are garbled or missing.

Callers can hear Cisco Unity system prompts, but Cisco Unity does not transmit any audio when a caller speaks.

For additional advanced audio troubleshooting tools, see the "Audio Troubleshooting Utilities in Cisco Unity 8.x" section.

Table 7-2 Advanced Audio Quality Troubleshooting 

Symptom
General Circumstances in Which Symptom Occurs
Correction Actions

Messages and/or Cisco Unity system prompts sound distorted.

You are using the G729a audio codec format for recording and listening to messages.

1. Confirm that the G.729a audio codec format is being used for message recording on the Cisco Unity server.

Note that when subscribers use a computer microphone as the recording device with Cisco Unity ViewMail for Microsoft Outlook and the Cisco Unity Inbox, their recordings are saved on the Cisco Unity server in the G.711 audio codec format—even when this is not the recording audio codec format specified for the Cisco Unity server.

2. Confirm that the Cisco Unified Communications Manager region is set to use the G.729a audio codec format. See the applicable Cisco Unified Communications Manager Administration Guide, available at http://www.cisco.com/en/US/products/sw/voicesw/ps556/tsd_products_support_series_home.html.

3. Confirm that the greetings, system prompts, and recorded names are in the G.729a audio codec format.

Note that when subscribers record their names and greetings by pasting a WAV file that is stored on their computers into the Media Master, the file is converted and saved on the Cisco Unity server in the G.711 audio codec format—even when this is not the recording audio codec format specified for the Cisco Unity server.

You are using the G.711 audio codec format for recording and listening to messages.

1. Confirm that the G.711 audio codec format is being used for message recording on the Cisco Unity server.

2. Confirm that the Cisco Unified Communications Manager region is set to the G.711 audio codec format. See the applicable Cisco Unified Communications Manager Administration Guide, available at http://www.cisco.com/en/US/products/sw/voicesw/ps556/tsd_products_support_series_home.html.

3. Confirm that the greetings, system prompts, and recorded names are in the G.711 audio codec format.

Only messages from unidentified callers are affected.

Check the Cisco gateway gain and attenuation levels. See the guide for your gateway, available at http://www.cisco.com/web/psa/products/index.html.

Hissing noise is heard when there is no audio from Cisco Unity, such as between system prompts or during transfers.

The problem can be reproduced on multiple subscriber phones.

Check the Cisco Unity comfort noise registry setting. See the "To View and Adjust the Cisco Unity Comfort Noise Registry Setting" procedure.

TTY characters are garbled or missing.

The problem occurs when using TTY phones.

1. Disable the Cisco Unity comfort noise registry setting. See the "To View and Adjust the Cisco Unity Comfort Noise Registry Setting" procedure.

2. Confirm that the G.711 audio codec format is being used for message recording on the Cisco Unity server. The G.711 Mu-Law audio codec format must be selected as the message recording and storage codec if you are using the Cisco Unity TTY language. Cisco Unity TTY is not compatible with the G.729a audio codec format or any other message recording audio codecs.

Message playback volume is higher or lower than the volume of Cisco Unity prompts, in special cases.

Affects unidentified caller messages only.

1. Check the Cisco gateway gain and attenuation levels. See the guide for your gateway, available at http://www.cisco.com/web/psa/products/index.html.

2. Check the wave gain playback and record settings. See the "Wave Gain for Recording and Playback in Cisco Unity 8.x" section.

Both subscriber and unidentified caller messages are affected.

Check the wave gain playback and record settings. See the "Wave Gain for Recording and Playback in Cisco Unity 8.x" section.

Cisco Unity plays system prompts but does not transmit voice.

The Cisco Unity server has dual NICs.

See the "Cisco Unity Plays System Prompts but Does Not Transmit Voice" section on page 10-1.


Wave Gain for Recording and Playback in Cisco Unity 8.x

The wave gain settings adjust record and playback volume for all recordings (messages, prompts, voice names, and greetings).

Confirm that the wave gain settings for both record and playback levels are set to 0 by using the Advanced Settings Tool, available in the Administrative Tools section of Tools Depot. For instructions, see the "To Adjust Greeting and Name Recordings by Using the Set Volume Utility" procedure.

Automatic Gain Control in Cisco Unity 8.x

Automatic gain control (AGC) gives subscribers consistent message playback levels through the normalization of recordings. AGC affects recordings only. It is on by default, is controlled by AGC settings in the Advanced Settings Tool of Tools Depot, and is applied to voice samples after they have passed through all external hardware.

AGC does not improve the quality of recordings; it only addresses volume issues. For example, it cannot improve garbled incoming messages.

The registry keys shown in Table 7-3 determine how Cisco Unity AGC normalizes recordings.

Table 7-3 Automatic Gain Control Settings in the Advanced Settings Tool of Tools Depot 

Setting
Purpose
Recommended Value

Audio - AGC: Adjust Volume Target Level for New Recordings

The dB level that Cisco Unity targets for normalizing the volume of all recordings.

The setting is systemwide.

-26 dB

The accepted range is -18 dB to -30 dB.

A setting of 0 (zero) disables AGC.

Audio - AGC: Sample Size

The buffer sample size that Cisco Unity uses to calculate the volume of a recording.

8000

Changing this value may degrade the sound quality of recordings and may reduce the performance of the Cisco Unity server.

Audio - AGC: Gain Threshold

The amount of change to the dB level that Cisco Unity applies to a recording when normalizing the volume.

5 dB

Changing this value may degrade the sound quality of recordings and may reduce the performance of the Cisco Unity server.

Audio - AGC: Minimum dB Threshold

The minimum dB level of a recording that Cisco Unity attempts to normalize. The setting prevents silence in a message and background hiss from being normalized.

-45 dB

The value is negative, even though the setting displays positive numbers.

The accepted range is -35 dB to -55 dB.


Comfort Noise in Cisco Unity 8.x

Comfort noise is low-level background noise generated on an IP device. The purpose of comfort noise is to simulate the hiss produced in a connection through a circuit-switched phone system. The noise is generated to help provide reassurance to callers when there is no audio from Cisco Unity, for example, during a transfer or between system prompts.

Comfort noise is not sent over the network, and is audible only on the IP device that receives a comfort noise generation packet. Comfort noise generation packets are sent by Cisco Unity when it is integrated with Cisco Unified Communications Manager, and when the registry setting HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Avaudio\Parameters\ComfortNoise is enabled.

The Cisco Unity ComfortNoise registry setting is a systemwide setting that controls the ability of Cisco Unity to send comfort noise generation packets to an IP phone, or to a gateway that is enabled to receive and respond to comfort noise generation packets. This registry setting does not affect comfort noise generation on a call between two IP phones. Cisco Unity also does not respond to comfort noise generation packets sent by other devices. These packets are treated as silence by the WAV driver.

If subscribers hear an audible hissing noise when there is no audio from Cisco Unity, and if it is judged to be too loud a noise, confirm that the Cisco Unity comfort noise registry setting is enabled (set to a value other than 128), and adjust the setting to a lower value as needed. The default value set during the installation of the Cisco Unity-CM TSP is 50 decimals (-50 dB).

If subscribers report that some Cisco Unity prompts sound mechanical or computerized when played back over the phone, the effect may be the result of a gateway-induced jitter buffer problem. Disabling Cisco Unity comfort noise resolves this issue.

If you are using the Cisco Unity TTY (ENX) language and TTY phones, and you are using direct connect mode to an FXS port (H.323 or MGCP to CCM3.3(2)), TTY subscribers may encounter occasional dropped or garbled TTY characters. Disabling the Cisco Unity comfort noise setting will correct this problem.


Note The registry setting for Cisco Unity comfort noise does not reflect the minus sign, so a registry setting of "50" is actually -50 dB.


There will always be some amount of hissing noise between prompts. The Cisco Unity ComfortNoise registry setting only tells the IP phone or gateway how loud that hiss will be. A value of 128 decimal causes the IP phone or gateway to use its default hiss level.

To View and Adjust the Cisco Unity Comfort Noise Registry Setting


Step 1 On the Cisco Unity server, on the Start menu, click Run.

Step 2 In the Run dialog box, enter regedit and click OK.


Caution Changing the wrong registry key or entering an incorrect value can cause the server to malfunction. Before you edit the registry, confirm that you know how to restore it if a problem occurs. (See the "Restoring" topics in Registry Editor Help.) Note that for a Cisco Unity failover system, registry changes on one Cisco Unity server must be made manually on the other Cisco Unity server, because registry changes are not replicated. If you have any questions about changing registry key settings, contact Cisco TAC.

Step 3 If you do not have a current backup of the registry, click File > Export, and save the registry settings to a file.

Step 4 Expand the registry key
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Avaudio\Parameters
and double-click the ComfortNoise value in the right pane.

Step 5 In the Edit DWORD Value dialog box, under Base, click Decimal.

Step 6 In the Value Data field, modify the Cisco Unity comfort noise setting as needed (valid settings are 0 through 128):

To decrease the volume of background noise between prompts and other audio, increase the setting (for example, to 60 dB). Make small adjustments to this setting of no more than 10 units.

To increase the volume of background noise, reduce the setting (for example, to 40 dB). Make small adjustments to this setting of no more than 10 units.

To disable Cisco Unity comfort noise, set the value to 128.

Step 7 Click OK.

Step 8 Exit the Registry Editor.

Step 9 Restart the Cisco Unity server.

Step 10 If you are using failover, repeat this procedure on the secondary Cisco Unity server.


Audio Troubleshooting Utilities in Cisco Unity 8.x

The following advanced audio utilities can be used to troubleshoot audio problems.


Caution We recommend that you use these tools only with Cisco TAC supervision.

CAP Ripper

The CAP Ripper utility extracts RTP audio from .cap files created by Sniffer Pro or Network Monitor.

Network Monitor (also known as NetMon) is a utility that comes with Microsoft Systems Management Server and Microsoft Windows. You use NetMon to capture and observe network traffic patterns and problems. For information on using NetMon, see the Microsoft Knowledge Base Article Q294818, available on the Microsoft Product Support website.

The CAP Ripper utility creates WAV files for each unique IP source and destination.

To Extract Audio by Using the CAP Ripper Utility


Step 1 Create a .cap file containing RTP audio by using NetMon or Sniffer Pro.

Step 2 Copy the .cap file to the \CommServer\Utilities\Audio directory on the Cisco Unity server.

Step 3 At a command prompt, browse to the \CommServer\Utilities\Audio directory, and enter capripper <Name of .cap file>.

For example, enter capripper capture1.cap.

WAV file output is generated for each unique IP source/destination combination. For example:

Creating 10.93.248.235(31640) to 10.93.248.227(22818).wav

Creating 10.93.248.227(22816) to 10.93.248.235(31640).wav

Step 4 Use the -s option to provide additional troubleshooting information about timing delays and sequencing of packets. For example, enter capripper -s capture1.cap.

The output shows detailed information from each of the WAV files. For example:

10.93.248.235(31640) to 10.93.248.227(22818).wav 
RTP packets processed 275 
Start seq 4881  End seq 5155 
Format g729a 
No packets out of sequence 
Avg. time between packets 20.03ms 
Longest packet delay 20ms 
Total frames in .cap file 1433

Step 5 If you receive the error message "No voice RTP packets found" when attempting to extract audio from a .cap file, verify that the capture file you are working with contains RTP packets.

If you are using a NetMon capture, and you are sure that the file contains RTP data, it may be possible that the starting offset of the capture data could not be determined. Use the -d option to view the binary data. For example, enter capripper -d netmon.cap.

A sample section of the output shows the following information:

000000A0  98 05 00 00 8D 7F 02 00 00 00 00 00 CE 01 00 00     ................ 
000000B0  00 00 00 00 00 00 00 00 29 04 00 00 00 00 00 00     ........)....... 
000000C0  FF FF FF FF FF FF FF FF 00 00 00 00 FF FF FF FF     ................ 
000000D0  FF FF FF FF 00 00 00 00 C8 4A 02 00 00 00 00 00     .........J...... 
000000E0  3C 00 00 00 3C 00 00 00 FF FF FF FF FF FF 00 02     <...<........... 
000000F0  A5 07 2A 18 08 06 00 01 08 00                         ..*.............

Step 6 To determine the starting offset, subtract 8 bytes from the first of two repeating DWORD values that you see in the .cap file. In the preceding example, the 3C value repeats on line E0. Note that the numbers in the file are in hex, and that there are 16 bytes displayed on each line. Eight bytes back from the first repeating DWORD value 0x3C is at 0x000000E0. Therefore, the starting offset of the first packet is
0xE0 - 8 = 0xD8 or 216.

Step 7 Indicate the starting offset obtained in Step 6 with the -o option. For example, enter capripper -o 216 netmon.cap.

The output will show the delay and packet sequencing information.


RTP Parser

The RTP Parser add-on can be used to expand NetMon capability to decode RTP packets when viewing capture files in real time, or when viewing saved .cap files.

Network Monitor (also known as NetMon) is a utility that comes with Microsoft Systems Management Server and Microsoft Windows. You use NetMon to capture and observe network traffic patterns and problems. For information on using NetMon, see the Microsoft Knowledge Base Article Q294818, available on the Microsoft Product Support website.

To Install the RTP Parser


Step 1 Copy the RtpParser.dll file from the CommServer\Utilities\Audio directory to the Windows\System32\Netmon\Parsers directory on the Cisco Unity server.

Step 2 Restart NetMon.


To View a Capture File by Using the RTP Parser


Step 1 Create a .cap file containing RTP audio by using NetMon.

Step 2 View the .cap by file using NetMon Capture Summary View.

Step 3 Double-click a frame row in the Summary View to see the RTP Parser View.