Anybody can explain me which are the differences between CCME and CUCE?
I have a customer that need 60 extensions and wants to use SIP not SCCP.
Is there any disadvantage if I use SIP? Can I register any vendor IP phone in the cisco SIP router?
Yes, you can use SIP phone with CCME, but the overall functionality will not good. Basically, cisco does not officially support non-cisco phones with CME. You will not have, or will have trouble enabling any feature like dual-line, call transfer, conference, etc.
I think the situation is not much different for CCM. Once something doesn't work with a non-cisco phones, you have no support from from Cisco.
I suggest you show him how the cisco phone works nicely in SCCP, with directories, etc.
But if I use cisco IP phones with SIP I haven't pay for the CCME license.
Will we have problems too? in call transfer, dual-line etc... if I'm using Cisco IP phones but using SIP?
As I know; Yes you can run SIP phones on CME, I didn't try it, but details are presented in document:
Cisco Unified Communications Manager
Express System Administrator Guide
which clearly tells that u can use IP Phones running SIP if ur CME 3.4 or later, u shall use "Voice register dn" instead of "ephone-dn", and "Voice register pool" instead of "ephone".
If u go for SIP, and it works, please let me know