we have a compatibility problem. We have a CCM 3.3.(4) and we are using IP Phones 7940 G series.
Currently in Spain Cisco does not comercialize this model and they has suggested to buy IP Phone 7941 G.
We have found in this url http://www.cisco.com/en/US/products/sw/voicesw/ps556/prod_software_versions_comparison.html#RANGE!A118 ",
information about compatibility between CCM 3.3(4) and "Cisco Unified IP Phone 7941 - SCCP" and it looks like it dosn?t apply and the last version possible is CCM 4.2(1).
Whe don?t consider to update this version of CCM right now. Can you suggest any alternative please?