Hi John,

From the data sheet the above model is compatible with 7900 and 6900 series which are SCCP phones. The 9900 series are SIP phones. See the discussion at this location <https://supportforums.cisco.com/thread/2043179> though it over an year old you will get the drift.

R D On Monday, February 6, 2012, Njiri John wrote:

Skunks

i have 9971 CISCO ip phones. does any one know if they are compatible with UC 560?

regards Njiri John