Cisco Cisco TelePresence Video Communication Server Expressway

Appendix 3 – Call flows for Multiway™ 

 

1.  When “Join” Is pressed, 1 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. 

 

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 “Join” 

 

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 

2 

Party 

3 

Cisco VCS 

MCU 

 

 

 

 

 

 

 

 INVITE 

(Party 2)

 

 

 

 

 

   

INVITE

 (party 2)

 

 

 

 

 TRYING  

 

 

   

TRYING 

  

  

RINGING 

   

   

RINGING 

  

   OK      

   

OK 

  

 ACK  

 

 

 

   

ACK 

  

Cisco VCS Deployment Guide: Multiway™ (Cisco VCS X5) 

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