Information Technology Reference
In-Depth Information
The entries consist of server certificate, including public key, server function, IP address, and so on.
When Cisco IP phones boot, they are able to obtain the CTL file from a TFTP server.
Figure 7-1
illustrates how the CTL Client builds the CTL and how the CTL is distributed to Cisco IP phones.
FIguRE 7-1
Method Used to Build
and Distribute the CTL
Cisco IP Phones Retrieve
the CTL When They Boot
CTL Client Builds
the CTL
TFTP
Server
CCM
Publisher
TFTP
Server
CAPF
Certificate Trust List (CTL)
CTL
Client
TFTP
Server
CAPF
CCM
Site
Admin
Security
To k e n
Certificate Trust List (CTL)
Alternate
TFTP
TFTP
Server
CAPF
CCM
Site
Admin
Security
To k e n
Alternate
TFTP
