Cisco SRND states that Call Manager can be configured to provide E911 Services without Cisco CER servers, but it will require to manually change the database if users are moved around. Dynamic Move/Add/Change can only be possible with CER Applications.
This could be dangerous if Administrator doesn't udpate the database in case there was a change, and if emergency occurs then 911 operators may end up in a wrong location.
I am not sure if I should offer or recommend this feature to our clients regardless they take full responsibility of manually updating the database. I feel it would be better for customers to go with basic 911 instead of E911 without CER servers.
Need some recommendations from the forum users.