McDewey

Anonymous Call Rejection for a Directory Number The Anonymous Call Rejection for a Directory Number feature allows the administrator to block anonymous calls for a particular Directory Number. This feature enables the administrator to have a granular control on allowing or disallowing anonymous callers from reaching a particular Directory Number. If the caller's DN is either not present or caller's DN is private and will not be displayed to the called party - then the call is from an anonymous caller. Anonymous calls in SIP are identified based on the criteria described in RFC 5079. Based on RFC 5079, calls are identified to be anonymous when incoming initial INVITE has: • From or PAI/PPI header with display-name "Anonymous" • From header host-portion = anonymous.invalid • Privacy: id or Privacy: user or Privacy: header [associated with PAI/PPI] • Remote-Party-ID header has a display-name "Anonymous" • Remote-Party-ID header has privacy=uri/name/full SIP Line Messaging Guide (Standard Edition) for Cisco Unified Communications Manager 39 SIP Standard Line Interface Anonymous Call Rejection for a Directory Number