+----------+                      +-----------+
              |  Alice   |                      |    Bob    |
              |          |                      |           |
              +----+-----+                      +-----+-----+
                   |                                  |
                   |                                  |
                   | SIP INVITE 1                     |
                   |--------------------------------->|
                   |                                  |
                   |                                  |
                   |                     SIP 200 OK 1 |
                   |<---------------------------------|
                   |                                  |
                   |                                  |
                   | SIP ACK 1                        |
                   |--------------------------------->|
                   |                                  |
                   |                                  |
                   |                                  |
                   |<########### MEDIA 1 ############>|
                   |   1 video A->B, 1 video B->A     |
                   |<################################>|
                   |                                  |
                   |                                  |
                   |                                  |
                   |<================================>|
                   |   CLUE DATA CHANNEL ESTABLISHED  |
                   |<================================>|
                   |                                  |
                   |                                  |
                   | CLUE OPTIONS                     |
                   |<*********************************|
                   |                                  |
                   |                                  |
                   |            CLUE OPTIONS RESPONSE |
                   |*********************************>|
                   |                                  |
                   |                                  |
                   | CLUE ADVERTISEMENT 1             |
                   |*********************************>|
                   |                                  |
                   |                                  |
                   |             CLUE ADVERTISEMENT 2 |
                   |<*********************************|
                   |                                  |
                   |                                  |
                   | CLUE ACK 1                       |
                   |<*********************************|
                   |                                  |
                   |                                  |
                   |                       CLUE ACK 2 |
                   |*********************************>|
                   |                                  |
                   |                                  |
                   | SIP INVITE 2 (+3 sendonly)       |
                   |--------------------------------->|
                   |                                  |
                   |                                  |
                   |                 CLUE CONFIGURE 1 |
                   |<*********************************|
                   |                                  |
                   |                                  |
                   |       SIP 200 OK 2 (+2 recvonly) |
                   |<---------------------------------|
                   |                                  |
                   |                                  |
                   | CLUE CONFIGURE RESPONSE 1        |
                   |*********************************>|
                   |                                  |
                   |                                  |
                   | SIP ACK 2                        |
                   |--------------------------------->|
                   |                                  |
                   |                                  |
                   |                                  |
                   |<########### MEDIA 2 ############>|
                   |   2 video A->B, 1 video B->A     |
                   |<################################>|
                   |                                  |
                   |                                  |
                   |       SIP INVITE 3 (+2 sendonly) |
                   |<---------------------------------|  
                   |                                  |                   
                   |                                  |
                   | CLUE CONFIGURE 2                 |
                   |*********************************>|
                   |                                  |
                   |                                  |
                   | SIP 200 OK 3 (+2 recvonly)       |
                   |--------------------------------->|
                   |                                  |
                   |                                  |
                   |        CLUE CONFIGURE RESPONSE 2 |
                   |<*********************************|
                   |                                  |
                   |                                  |
                   |                        SIP ACK 3 |
                   |<---------------------------------|
                   |                                  |
                   |                                  |
                   |                                  |
                   |<########### MEDIA 3 ############>|
                   |   2 video A->B, 2 video B->A     |
                   |<################################>|                   
                   |                                  |
                   |                                  |
                   |                                  |
                   v                                  v