/mcpConfidential Access Level Confidential Access Level (CAL) is a Department of Defence feature. Confidential Access Level controls which calls can be completed and persistently displays information on the phone that conveys additional information about the call. SIP Phones 9971, 9951, and 8961 support the Confidential Access Level feature. In a CAL enabled system, every device, line, and trunk has a configured CAL value, which is a numeric value within the range of 0-99. Confidential Access Level has two modes: • Fixed mode: • Emphasizes the CAL level over call completion. • The calculation is done at each hop: an incoming CAL is resolved against the outgoing CAL. • The resolved CAL must match the CAL of whichever party is in Fixed mode, which could be one or both parties of the call. • Variable mode: • Emphasizes call completion over CAL level. • The calculation is done at each hop: an incoming CAL is resolved against the outgoing CAL. • The numeric value may change as the call moves through the voice network. As long as it resolves to a value, the call is allowed to proceed to next hop. The Enterprise Parameter to enable or disable the Confidential Access Level feature is 'Confidential Access Level (CAL) Enforcement’. Confidential-Access-Level SIP Header is a new SIP header used to negotiate CAL between AS-SIP enabled Call Agents. Syntax: Confidential-Access-Level = “Confidential-Access-Level” HCOLON local-access-level SEMI reflected-access-level [SEMI access-display] local-access-level = (access-level SEMI access-mode) reflected-access-level = (“ref” EQUAL access-level SEMI reflected-mode) access-level = (1*2DIGIT ; 0 to 99) access-mode = (“mode” EQUAL mode-param) reflected-mode = (“rmode” EQUAL mode-param) mode-param = (fixed / variable) access-display = (1*16display-text) display-text = (ALPHA/SP/”/”/”-”) The Enterprise Parameter displays the display-text present in CAL header and Enterprise Parameter does not generate the CAL header in any message. CAL in initial INVITE: Confidential-Access-Level: 4;mode=variable;ref=0;rmode=fixed;PENDING CAL in 200 OK to INVITE: SIP Line Messaging Guide (Standard Edition) for Cisco Unified Communications Manager 46 SIP Standard Line Interface Confidential Access Level