C-26
SIP Phone to Phone via Gateway: Called Party is Busy
SIP Phone to Phone via Gateway: Called Party is Busy
Call Scenario Figure C-10 illustrates User A initiating a call to User B while User B is busy.
Figure C-10. SIP Phone to Phone: Called Party is Busy
Call Flow Diagram Figures C-11 and C-12shows a call originating from an on-network SIP
phone, being routed through a gateway to the PSTN, and returning a busy
signal.
Gateway
User A
PSTN
Calling Party
Redirect Server
User Agent Gateway
Marshal Server Marshal Server
User B
(Busy)
VOCAL System