/mcpPresentation Name and Number value to True, Cisco Unified Communications Manager displays Customer Care / 1800000 on the called device. If you uncheck the Enable External Presentation Name and Number check box or set the Display External Presentation Name and Number to False, then Cisco Unified Communications Manager displays Your personal adviser / user1@example.com on the called device. Outgoing Call Process Let us assume, a user configured with External Presentation Name and Number initiates a call to a PSTN network through the SIP trunk with Enable External Presentation Name and Number configured in its SIP Profile. Then, Cisco Unified Communications Manager sends the configured External Presentation Information in the FROM header of the outgoing SIP message and displays on the called device. If Enable External Presentation Name and Number option is disabled or External Presentation Number and External Presentation Name fields are not configured, the Cisco Unified Communications Manager sends the directory number information in the FROM and PAID headers and displays on the called device. External Presentation Number Mask Operation Cisco Unified Communications Manager allows you to mask the external presentation number, to be displayed on the called device. You can mask the presentation number on the Directory Number Configuration, SIP Profile Configuration, and Trunk Configuration pages. When you enter the digits in the External Presentation Number field with trailing X, the value of X is replaced with the directory number information starting from right to left. Mask Operation on Directory Number Configuration If you mask External Presentation Number as 180011XXXX on Directory Number Configuration page for a Directory Number 5551234, then Cisco Unified Communications Manager displays the presentation number as 1800111234 on the called device. Mask Operation on SIP Profile Configuration Let us assume External Presentation Number on Directory Number page is 180011XXXX and if you mask External Presentation Number on SIP Profile Configuration page as 180022XXXX for a Directory Number 5551234, then Cisco Unified Communications Manager displays the presentation number as 1800221234 on the called device. Mask Operation on Trunk Configuration Let us assume External Presentation Number on Directory Number page is 180011XXXX and on SIP Profile Configuration page is 180022XXXX. If you mask Presentation Number on Trunk Configuration page as 180033XXXX for a Directory Number 5551234, then Cisco Unified Communications Manager displays the presentation number as 1800331234 on the called device. Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs 781 Advanced Call Processing Outgoing Call Process