SIP Phone to PSTN: Call Blocking
C-51
SIP Phone to PSTN: Call Blocking
Call Scenario Figure C-16 illustrates the following call scenario:
•User A initiates a long distance or 1-900 number call
•The VOCAL System blocks the call
Figure C-18. SIP IP Phone to Phone: Call Blocking
Call Flow Diagram Figure C-19 shows a call, originating from an on-network SiP IP phone,
being blocked by the feature server.
Gateway
User A
PSTN
Calling Party
Redirect Server
User Agent Gateway
Marshal Server Marshal Server
1-900
Called Party
Call Blocking
Feature Server
VOCAL System