Cisco 7821 Administration Manual page 208

Control Debug Information from Cisco Unified Communications Manager
• The format for the IPv4 Log Server address is address:<port>@@base=<0-7>;pfs=<0-1>
• The format for the IPv6 Log Server address is [address]:<port>@@base=<0-7>;pfs=<0-1>
• Where:
Cisco IP Phone 7821, 7841, and 7861 Administration Guide for Cisco Unified Communications Manager 10.0
(SIP)
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◦ the IPv4 address is separated with dot (.)
◦ the IPv6 address is separated with colon (:)