STUN/TURN                                                STUN/TURN
Servers          Alice                      Bob          Servers
   |               |                             |               |
   |<--------------|                             |               |
   |               |                             |               |
   |               |                             |               |
   |   Candidate   |                             |               |
   |               |                             |               |
   |               |                             |               |
   |   Discovery   |                             |               |
   |               |                             |               |
   |               |                             |               |
   |-------------->|       INVITE (Offer)        |               |
   |               |---------------------------->|               |
   |               |        183 (Answer)         |-------------->|
   |               |<----------------------------|               |
   |               |  INFO (repeated candidates) |               |
   |               |---------------------------->|               |
   |               |                             |               |
   |               |    INFO (more candidates)   |   Candidate   |
   |               |<----------------------------|               |
   |               |    Connectivity Checks      |               |
   |               |<===========================>|   Discovery   |
   |               |   INFO (more candidates)    |               |
   |               |<----------------------------|               |
   |               |    Connectivity Checks      |<--------------|
   |               |<===========================>|               |
   |               |                             |               |
   |               |          200 OK             |               |
   |               |<----------------------------|               |
   |               |                             |               |
   |               |<======= MEDIA FLOWS =======>|               |
   |               |                             |               |