With this feature, you can enable EC500 users to use in-call features, such as Hold and consult, Transfer, and Conference. To enable the in-call features, users must dial Feature Access Code (FAC) that you have configured.

EC500 in-call feature invocation supports the out-of-band and rtp-payload digit detection mechanism. Communication Manager supports this detection only on H323 and SIP trunks.

You must administer Avaya Aura® Media Server or Branch Gateway as media resource on Communication Manager.

You must configure a large number of media resources with Communication Manager to support EC500 calls on local media resources. Otherwise, the total number of simultaneous calls supported are reduced. If no media resources are available, Communication Manager logs the No channel resources denial event.

Communication Manager transmits all FAC digits to the far-end signaling group by using the end-to-end signaling to provide information to applications such as voice mail. The required digits for the application are in conflict with the FAC. Therefore, you must configure FAC so that it does not conflict with other applications.