To change the recording and storage codec for new messages, you use the Set Record Format utility, available in the Cisco Unity Tools Depot.
If anything, the quality suffers during transcoding, especially when the sampling rate is changed.įor example, to preserve the best possible sound quality, do not use OKI ADPCM 6 kHz if it will then need to be converted to G.711 Mu-Law 8 kHz to play on Cisco hardware. When a message is recorded and stored in a lower-quality codec and then later converted to a higher-quality codec during playback, the sound quality does not improve. In a networked environment, different Cisco Unity servers may be configured with different recording and storage codecs to meet the needs of their sites. In sites with only one Cisco Unity server installed, a single codec is chosen for message recording and storage. For circuit-switched phone system codec setup, refer to the manufacturer documentation. Ī site with a circuit-switched phone system integration may choose to use G.711 or one of the OKI ADPCM codecs for message recording and storage. Refer to the Cisco CallManager Administration Guide for your version of Cisco CallManager, available at. If OKI ADPCM, GSM 6.10, or G.726 codecs are used for message storage on a Cisco Unity system with a Cisco CallManager integration, transcoding will take place at the Cisco Unity server, and this may affect audio quality and system performance.Ĭisco CallManager codecs are set up by using the Region Configuration Settings. G.711 and G.729a codecs are supported by Cisco CallManager and Cisco Unity, and are recommended for best sound quality and system performance. If you are installing a new phone system or upgrading an existing phone system, confirm that the phone system codec that you want to use is supported for use with Cisco Unity. The phone system codec is chosen and set up when the system is installed. See the "Testing the Codec Configuration Changes" section. See the "Changing the Message Retrieval Codec(s)" section.Ħ. Choose one or more codecs for message retrieval, and configure each subscriber workstation as needed. See the "Changing the Codec Format of System Prompts" section.ĥ. Match the codec format of Cisco Unity system prompts to the message recording and storage codec. See the "Changing the Codec Format of Existing Greetings and Recorded Names" section.Ĥ. Match the codec format of Cisco Unity recorded names and greetings to the message recording and storage codec.
See the "Changing the Message Recording and Storage Codec" section.ģ. Choose a codec for message recording and storage. See the "Confirming or Changing the Phone System Codec" section.Ģ. Confirm or change the phone system codec. If a task does not apply to your situation, skip it.ġ. Generally, the following tasks are needed to change the Cisco Unity system configuration to use one or more of the supported codecs. See the "Task List for Changing Cisco Unity Codecs" section.įor information on choosing and implementing audio codecs during a new Cisco Unity installation, refer to White Paper: Audio Codecs and Cisco Unity at. If you change one or more of the codecs in use on the Cisco Unity system, then you need to evaluate codec compatibility systemwide.
Changing the Codec Format of System Prompts.Changing the Codec Format of Existing Greetings and Recorded Names.Changing the Message Retrieval Codec(s).Changing the Message Recording and Storage Codec.Confirming or Changing the Phone System Codec.Task List for Changing Cisco Unity Codecs.Configuration Changes That May Require Cisco Unity Codec Changes.This chapter contains the following sections: Task List for Changing Cisco Unity CodecsĬonfirming or Changing the Phone System CodecĬhanging the Message Recording and Storage CodecĬhanging the Codec Format of Existing Greetings and Recorded NamesĬhanging the Codec Format of System Prompts Configuration Changes That May Require Cisco Unity Codec Changes
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