According to this, 7916 won't work with CM 4.1
is there any device pack that can make it happen?
or upgrading to newer CM version is the only option?
http://www.cisco.com/en/US/prod/collateral/voicesw/ps6788/phones/ps379/data_sheet_c78-468673.html
Cisco Unified Communications Manager 4.2(3) SR3a, 4.3(2), 5.1(3)b, 6.1(1), 7.0, 7.1 and later; Cisco Unified Communications Manager Express 4.3/7.0 and later.