Cisco Cisco TelePresence Video Communication Server Expressway

Appendix 3 – Call flows for Multiway™ 

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

Page 23 of 25 

 

 

 

Multiway 

Conference 

Initiator 

Party 

2 

Party 

3 

Cisco VCS 

MCU 

 

    

OK 

 

   

OK 

  

   

Notify 

  

   

Notify 

  

 Bye 

(3)  

 

 

 

   

Bye 

(3) 

  

 

 

 

 

 

 

 

All 3 parties in an MCU hosted conference call 

 

 

 

 

 

 

 

 

H.323 works in a similar manner, using routeToMC facility messages to indicate which conference ID 
to dial. 

 

Cisco VCS interworks H.323 calls to Conference Factory into SIP, so the Conference Factory 
always sees an INVITE when Join is pressed, and responds with the 302 temporarily moved. 
Cisco VCS interworking converts the 302 into a routeToMC facility message. 

 

The initiating H.323 endpoint then sends routeToMC facility messages to the endpoints that are to 
join the Multiway™ conference.