/mcpNote: Note: When you have VoIP trunks, you are able to see all the call legs with the show call active voice brief command. In some versions of Cisco IOS Software Release 12.2, there is a bug in the show call active command and a fax call that comes through a VoIP trunk no longer appears. When you issue a show call active fax brief command, the call is now listed. For more information about this bug, see Cisco bug ID CSCdx50212
