Figure 5: Sip Register Trunk Status - Grandstream Networks UCM6100 Manual

7. Configure inbound and outbound rules on two UCMs to make sure the extensions on UCM1 can reach
the extensions on UCM2 through the SIP register trunk and vice versa.
8. For the extensions on both UCM6100 that you would like to use call completion, go to the UCM6100
web GUI->PBX->Basic/Call Routes->Extensions page, create or edit extension with the following
configured in "Features" tab:

"Enable CC": selected

"CC Mode": set to "Normal"
9. Feature code for call completion request can be modified on web GUI->PBX->Internal
Options->Feature Codes page. The default setting is *11 for "Call Completion Request" and *12 for
"Call Completion Cancel".

Figure 5: SIP Register Trunk Status

UCM6100 Busy Camp-on Guide Page 8 of 10