ISDN interface configuration task list
394
SmartWare Software Configuration Guide
34 • ISDN interface configuration
Figure 56. Example SIP network connecting two device to give a home office access to the CO PBX
The phone in the home office has two active calls to other subscribers of the PBX in the central office. The user
wants to connect the other two participants and
(a)
sends an explicit call-transfer invocation to the device HO.
The device HO internally connects the two calls and sends a DISCONNECT message to the phone for both
calls. In a second step
(b)
the firmware on HO detects an internal loop. Both call legs are connected to the
same network. In this example, both call legs are handled by the same SIP gateway. The firmware on device
HO sends a REFER message to device CO, which connects the two call legs internally and sends a BYE mes-
sage to the device HO.
(c)
Again the firmware of CO detect an internal loop. This time the call legs are han-
dled by the same SIP interface, connected to the PBX. Since the ISDN port is a user port it sends an explicit
call-transfer invocation to the PBX
(d)
, which connects the call and sends the device CO a DISCONNECT
message for both calls. During all these push back operations the datapath of the two participants
keeps connected.
The push back mechanism over ISDN (using ECT) and SIP (using REFER) works independently of the pro-
tocol that invoked the call-transfer. For example, the same scenario also works if the phone in the home office
is connected to an FXS port.
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Содержание SmartNode Series
Страница 250: ...RIP configuration task list 250 SmartWare Software Configuration Guide 23 RIP configuration rip enabled ...
Страница 635: ...635 Appendix A Terms and definitions Chapter contents Introduction 636 SmartWare architecture terms and definitions 636 ...
Страница 641: ...641 Appendix B Mode summary Chapter contents Introduction 642 ...
Страница 648: ...648 Appendix D Internetworking terms acronyms Chapter contents Abbreviations 649 ...
Страница 653: ...653 Appendix E Used IP ports available voice codecs Chapter contents Used IP ports 654 Available voice codecs 655 ...