New 7841 phones don't register on network

[khupchick]

Usually we plug in a new phone and it goes through the process of registering.  We purchased a batch of new phones that just sit at an old date and time when connected.  I have looked in the Network settings and changed from static to DHCP and the phone has picked up the proper VLAN and gateway and states it has an IP address.   I configured the phone with a number in CUCM but when you bring up the number it is not registered. 

Thank you,

KH

[Nithin Eluvathingal]

You can see it from the phone settings. what was the reason to configure static ? the phones where not able to get the IP address from DHCP ? 

[khupchick]

The phone was set to static and I changed it to DHCP and it picked up the proper gateway and server address, VLAN.

[Jaime Valencia]

If you're using auto-registration, do you still have available DNs available?

Does the server to which you're trying to register has enough capacity to register the phone?