Cisco Cisco TelePresence Video Communication Server Expressway

Appendix 3 – Call flows for Multiway without Conductor

Cisco TelePresence Multiway Deployment Guide (Cisco VCS X7.2 and Conductor XC1.2)

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Appendix 3 – Call flows for Multiway without
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 Cisco 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:



Party 2 calls the Multiway initiator



Multiway initiator answers call



Multiway initiator puts Party 2 on hold



Multiway initiator calls Party 3



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.

Multiway

Conference

Initiator

Party

Cisco VCS

MCU

INVITE

(Party 2)

INVITE

(party 2)

TRYING

RINGING

ACK