SCCP
Cisco IP Phones using SCCP can coexist in an H.323 environment. When used with Cisco
CallManager, the SCCP client can interoperate with H.323-compliant terminals. Application
layer functions in the Security Appliance recognize SCCP version 3.3. The functionality of
the application layer software ensures that all SCCP signaling and media packets can traverse
the firewall by providing NAT of the SCCP signaling packets.
Application inspection for SCCP is enabled by default using the inspect sccp command. You
can use the class-map command to change the default port assignment for SCCP, as shown
in Example 19-3.