Cisco Cisco TelePresence Video Communication Server Expressway
Appendix 3: Call flows for Multiway without
TelePresence Conductor
TelePresence Conductor
Overview of Multiway call flow
1. When “Merge” Is pressed, one call is on hold and the other is live.
2. The initiator endpoint puts the live call on hold.
3. The initiator endpoint makes a call to its programmed Multiway URI.
4. This programmed Multiway URI matches a Conference Factory URI configured in a VCS.
5. The Conference Factory returns a “Temporarily moved to <URI of MCU>” message.
6. The initiator calls the <URI of MCU>.
7. Once answered the initiator tells one held party to now call <URI of MCU>.
8. Then the initiator tells the other held party to now call <URI of MCU>.
9. All 3 parties are now in a call.
SIP
Example call flow, assuming:
n
Party 2 calls the Multiway initiator
n
Multiway initiator answers call
n
Multiway initiator puts Party 2 on hold
n
Multiway initiator calls Party 3
n
Multiway initiator presses “Merge”
This sequence diagram shows the key SIP messaging, not all messages are shown for example no INFO
(fast picture update) messages are shown.
(fast picture update) messages are shown.
Multiway Conference
Initiator Party 2 Party 3 VCS MCU
Initiator Party 2 Party 3 VCS MCU
INVITE (Party 2)
INVITE (Party 2)
TRYING
TRYING
RINGING
RINGING
OK
Cisco TelePresence Multiway™ Deployment Guide (X8.2, XC2.4)
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Appendix 3: Call flows for Multiway without TelePresence Conductor