Conference layout control and control protocol
A technology of conference and layout, applied in the direction of video conference system, TV, two-way work system, etc.
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[0461] Example: Subscriber A at POTS1 calls subscriber B at ViPr V1. The following sequence of events occurs:
[0462] 1. UD1 (Mediatrics or any unicast device) receives a request from User_A to connect to User_B.
[0463] 2. UD1 sends an invitation to UAM. The To field or display name in the invitation identifies that the call is for User_B.
[0464] 3. The UAM receives the invitation as an incoming call C1.
[0465] 4. UAM extracts User_B's sip address from the invitation on C1 and initiates a call to C2 to this user by sending an invitation to V1.
[0466] 5. The UAM also cross-connects C1 to C2.
[0467] 6. V1 sees an incoming INVITE from UAM, which is recognized by the SDP as a ViPr class device. Therefore, the software on V1 knows that the peer software can support all the functionality that a ViPr device is expected to have (including replacement / review etc.).
[0468] 7. User_B, eg at V1, replies OK to the invitation.
[0469] 8. The UAM marks the connection C2 ...
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