Specifies which part of the call will be managed. This option is used only by the PlayFiles and Say instructions to indicate which channel the sound will be played on. Valid options are caller, callee or both. If not specified, the default value is caller.callLeg identifier is ignored for calls that are part of a conference and calls initiated using the Callout API.
Optionalmanage
The unique identifier of the call. This value is generated by the system.