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Line 6 key (if available) - Selects line six. 13 None No function selected. Line 7 key (if available) - Selects line seven. 14 None No function selected. Line 8 key (if available) - Selects line eight. 15 None No function selected. Line 9 key (if available) - Selects line nine. 41-001160-01, Rev 00, Release 2.3 5-153 IP Phone Administrator Guide Operational Features Feature Key Programming Guidelines The following are guidelines to use when programming the feature keys on the handset: