System Administration Guide for Cisco Unity Connection Release 2.x - Changing the Audio Format of Recordings and Media Streams [Cisco Unity Connection]

Table Of Contents

Changing the Audio Format of Recordings and Media Streams

Changing the Audio Format That Cisco Unity Connection Uses for Calls

Changing the Audio Format for Recordings

Changing the Audio Format of Recordings and Media Streams

See the following sections:

•Changing the Audio Format That Cisco Unity Connection Uses for Calls

•Changing the Audio Format for Recordings

Changing the Audio Format That Cisco Unity Connection Uses for Calls

For calls, Cisco Unity Connection advertises the audio format (or codec) that is preferred for the media stream with the phone system. You should consider the following when setting the audio format:

•Connection should use the same audio format for the media stream that the phone system uses for the following reasons:

–To reduce the need for transcoding the media stream from one audio format to another.

–To minimize the performance impact on the Connection server and on the phone system.

–To preserve the audio quality of calls.

•When Connection advertises a different audio format than the one used by the phone system, the phone system will transcode the media stream.

To Change the Audio Format That Cisco Unity Connection Uses for Calls

Step 1 In Cisco Unity Connection Administration, expand Telephony Integrations, then click Port Group.

Step 2 On the Search Port Groups page, click the port group that belongs to the phone system integration for which you want to change the audio format of the media stream.

Step 3 On the Port Group Basics page, on the Edit menu, click Codec Advertising.

Step 4 On the Edit Codec Advertising page, click the up and down arrows to change the order of the codecs or to move codecs between the Advertised Codec box and the Unadvertised Codecs box.

If only one codec is in the Advertised Codecs box, Cisco Unity Connection will send the media stream in the that audio format. The phone system will transcode if it does not use this audio format.

If two or more codecs are in the Advertised Codecs box, Connection will advertise its preference for the first codec in the list but will send the media stream in the audio format from the list that the phone system selects.

Step 5 Click Save.

Step 6 (PIMG, TIMG, and SIP integrations only) If you want to change the packet size that is used by the advertised codecs, under Advertised Codec Settings, click the applicable packet setting for each codec and click Save.

Step 7 On the Port Group menu, click Search Port Groups.

Step 8 Repeat Step 2 through Step 7 for all remaining port groups that belong to the phone system integration for which you want to change the audio format of the media stream.

Changing the Audio Format for Recordings

Typically, Cisco Unity Connection uses the same audio format (or codec) for recording a message that the playback device uses. For example, if users listen to messages primarily on a phone system extension, Connection should record messages in the same audio format that the phone system uses. If the users listen to messages on Personal Digital Assistants (PDAs), however, Connection should record messages in the audio format that the PDAs use (such as GSM 6.10).

You should consider the following when setting the audio format for recording messages:

•Setting the audio format for recordings affects all messages, greetings, and names system-wide for all users.

•Minimizing the number of different audio formats in use by Connection for recording and playing back recorded messages, greetings, and names reduces transcoding between audio formats that Connection must perform, and thus reduces the affect on the performance of the Connection server.

•When a message, greeting, or name is recorded in a lower quality audio format and later transcoded to a higher quality audio format during playback, the sound quality is not improved. Usually, the sound quality of a recording suffers during transcoding, especially when the sampling rate is changed.

For example, sound quality suffers when messages that are recorded in the G.729a audio format are played back on devices that use the G.711 Mu-Law audio format. However, sound quality is preserved when messages that are recorded in the G.711 Mu-Law audio format are played back on devices that use the same audio format.

•Changing the audio format for recordings affects only messages, greetings, and names that are recorded after the setting is changed. Existing messages, greetings, and names that were recorded in a different audio format are not affected by the new setting.

To Change the Audio Format for Recording Messages

Step 1 In Cisco Unity Connection Administration, expand System Settings, then click General Configuration.

Step 2 On the General Configuration page, in the Recording Format list, click the applicable setting.

If the playback device uses a different audio format, Connection must transcode the messages, greetings, and names into the applicable audio format or the playback device will not be able to play them.

Step 3 Click Save.

	System Administration Guide for Cisco Unity Connection Release 2.x
	Changing the Audio Format of Recordings and Media Streams
System Administration Guide for Cisco Unity Connection Release 2.x Index Preface Configuring the Browser on an Administrator Workstation Accessing and Using Cisco Unity Connection Administration Administrative Tools Call Management Overview Creating a Call Management Plan Managing Call Handlers Managing Directory Handlers Managing Interview Handlers Managing Call Routing Tables Managing Schedules and Holidays Managing Restriction Tables Cisco Unity Connection Conversation Changing Conversation Settings for All Users Changing the Audio Format of Recordings and Media Streams Managing Recorded Greetings and Recorded Names Specifying Password, Logon, and Lockout Policies Messaging Specifying Mailbox Size Quotas Changing the Message Aging Policy Setting Up SMTP Message Notifications Securing User Messages: Controlling Access, Distribution, and Longevity Securing Cisco PCA and IMAP E-Mail Client Access to Cisco Unity Connection Setting Up Broadcast Messaging Managing System Distribution Lists Managing the Phone System Integrations Setting Up Phone View Using VPIM Networking Integrating with Cisco Unified MeetingPlace Express Configuring Service Parameters Configuring Enterprise Parameters Installing Plugins Configuring Access to Exchange E-Mails Through TTS Configuring Access to Exchange Calendars and Contacts for Personal Call Transfer Rules Generating Reports Managing Licenses	Download this chapter Changing the Audio Format of Recordings and Media Streams Download the complete book PDF Version of the Entire Guide (PDF - 5 MB) Feedback Table Of Contents Changing the Audio Format of Recordings and Media Streams Changing the Audio Format That Cisco Unity Connection Uses for Calls Changing the Audio Format for Recordings Changing the Audio Format of Recordings and Media Streams See the following sections: •Changing the Audio Format That Cisco Unity Connection Uses for Calls •Changing the Audio Format for Recordings Changing the Audio Format That Cisco Unity Connection Uses for Calls For calls, Cisco Unity Connection advertises the audio format (or codec) that is preferred for the media stream with the phone system. You should consider the following when setting the audio format: •Connection should use the same audio format for the media stream that the phone system uses for the following reasons: –To reduce the need for transcoding the media stream from one audio format to another. –To minimize the performance impact on the Connection server and on the phone system. –To preserve the audio quality of calls. •When Connection advertises a different audio format than the one used by the phone system, the phone system will transcode the media stream. To Change the Audio Format That Cisco Unity Connection Uses for Calls Step 1 In Cisco Unity Connection Administration, expand Telephony Integrations, then click Port Group. Step 2 On the Search Port Groups page, click the port group that belongs to the phone system integration for which you want to change the audio format of the media stream. Step 3 On the Port Group Basics page, on the Edit menu, click Codec Advertising. Step 4 On the Edit Codec Advertising page, click the up and down arrows to change the order of the codecs or to move codecs between the Advertised Codec box and the Unadvertised Codecs box. If only one codec is in the Advertised Codecs box, Cisco Unity Connection will send the media stream in the that audio format. The phone system will transcode if it does not use this audio format. If two or more codecs are in the Advertised Codecs box, Connection will advertise its preference for the first codec in the list but will send the media stream in the audio format from the list that the phone system selects. Step 5 Click Save. Step 6 (PIMG, TIMG, and SIP integrations only) If you want to change the packet size that is used by the advertised codecs, under Advertised Codec Settings, click the applicable packet setting for each codec and click Save. Step 7 On the Port Group menu, click Search Port Groups. Step 8 Repeat Step 2 through Step 7 for all remaining port groups that belong to the phone system integration for which you want to change the audio format of the media stream. Changing the Audio Format for Recordings Typically, Cisco Unity Connection uses the same audio format (or codec) for recording a message that the playback device uses. For example, if users listen to messages primarily on a phone system extension, Connection should record messages in the same audio format that the phone system uses. If the users listen to messages on Personal Digital Assistants (PDAs), however, Connection should record messages in the audio format that the PDAs use (such as GSM 6.10). You should consider the following when setting the audio format for recording messages: •Setting the audio format for recordings affects all messages, greetings, and names system-wide for all users. •Minimizing the number of different audio formats in use by Connection for recording and playing back recorded messages, greetings, and names reduces transcoding between audio formats that Connection must perform, and thus reduces the affect on the performance of the Connection server. •When a message, greeting, or name is recorded in a lower quality audio format and later transcoded to a higher quality audio format during playback, the sound quality is not improved. Usually, the sound quality of a recording suffers during transcoding, especially when the sampling rate is changed. For example, sound quality suffers when messages that are recorded in the G.729a audio format are played back on devices that use the G.711 Mu-Law audio format. However, sound quality is preserved when messages that are recorded in the G.711 Mu-Law audio format are played back on devices that use the same audio format. •Changing the audio format for recordings affects only messages, greetings, and names that are recorded after the setting is changed. Existing messages, greetings, and names that were recorded in a different audio format are not affected by the new setting. To Change the Audio Format for Recording Messages Step 1 In Cisco Unity Connection Administration, expand System Settings, then click General Configuration. Step 2 On the General Configuration page, in the Recording Format list, click the applicable setting. If the playback device uses a different audio format, Connection must transcode the messages, greetings, and names into the applicable audio format or the playback device will not be able to play them. Step 3 Click Save.
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