/mcp• To edit a port group, change the applicable settings in Port Group Advanced Settings and select Save. • To enable or disable normalization, change the applicable settings in Audio Normalization for Recordings and Messages and select Save. Codec Advertising For calls, Unity Connection advertises the audio or video format (or codec) that is preferred for the media stream with the phone system. For the following reasons, Unity Connection should use the same audio or video format for the media stream that the phone system uses: • To reduce the need for transcoding the media stream from one audio or video format to another. • To minimize the performance impact on the Unity Connection server and on the phone system. • To preserve the audio or video quality of calls. When Unity Connection advertises a different audio or video format other than the one used by the phone system, the phone system transcodes the media stream. Changing the Audio or Video Format Used for Calls Procedure Step 1 In Cisco Unity Connection Administration, expand Telephony Integrations, and then select Port Group. Step 2 On the Search Port Groups page, select the port group that belongs to the phone system integration for which you want to change the audio or video format of the media stream. Step 3 On the Port Group Basics page, select Edit, and then select Codec Advertising. Step 4 On the Edit Codec Advertising page, select the Up and Down arrows to move the codec between the Advertised Codec box and the Unadvertised Codecs box, and then select Save. Step 5 (Only SIP integrations) If you want to change the packet size that is used by the advertised codecs, select the applicable packet setting for each codec in the Packet Size list, and then select Save. Trunk When multiple phone systems are integrated with Cisco Unity Connection, you can configure a phone system trunk so that calls on one phone system can be transferred to extensions on another phone system. Phone system trunks are accessed by dialing extra digits (for example, dialing 9) before dialing the extension. Cisco Business Edition does not support phone system trunks. Note System Administration Guide 74 Telephony Integration Codec Advertising