Hi,
At 3com phone, just find any related to TFTP such as Proxy, outbound proxy, register server to input your CCM IP address.
If you could find that, that will solve your problem at the first step.
To configure CCM:
1) provide dummy Mac address of the phone
2) Create another Phone security profile that are using secure device authentication.
3) Register the phone
3) Create an end user
- in the end user, put the digest credentials (same as password in your phone).
4)Associate the end user to the phone.
5) Choose which digest user in phone configuration window.
6) Reset the phone.
There you go!
