[cisco-voip] CUPS with CUPC on CCM 5.1

[al]

Hi,

I am trying to interconnect a CCM 5.1.2 with a Cisco Unified Personal 
Server 6.0.2, and I am having some issues.
I am using CUPC 1.2.

I read the administration guide of CUPS 6.0.1, and I followed this link 
in order to troubleshoot my configuration:
http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_tech_note09186a00808a2b0d.shtml

- The troubleshooter shows all green.

But there are Two point that I really don't understand:

- In *Cisco Unified Presence - Settings*.*,* I put the address of my 
tftp server address (the callmanager), but when I log on the CUPC, and I 
check the connectivity, this field (tftp server) is red. It seems like 
my CUPC cannot find my TFTP server.
Why do we need a tftp server with CUPS?

- Do I really need A Ldap Server, my CallManager cannot give the 
presence settings and all the other personal settings?
Is it worthwhile to add this LDAP Server ?

In my actual configuration I cannot add other user to my contact list, 
cannot see the presence settings and cannot use IM (due to the two 
previous point ?)

Thank you in advance for any clarification or explanation.