STUN/TURN                                                STUN/TURN
    Servers          Alice                      Bob          Servers
       |               |                         |                |
       |  STUN Bi.Req. |     INVITE (Offer)      |                |
       |<--------------|------------------------>|                |
       |               |      183 (Answer)       | TURN Alloc Req |
       | STUN Bi.Resp. |<------------------------|--------------->|
       |-------------->|  INFO/OK (SRFLX Cand.)  |                |
       |               |------------------------>| TURN Alloc Resp|
       |               |  INFO/OK (Relay Cand.)  |<---------------|
       |               |<------------------------|                |
       |               |                         |                |
       |               |  More Cands & ConnChecks|                |
       |               |<=======================>|                |
       |               |                         |                |
       |               |          200 OK         |                |
       |               |<------------------------|                |
       |               |            ACK          |                |
       |               |------------------------>|                |
       |               |                         |                |
       |               |<===== MEDIA FLOWS =====>|                |
       |               |                         |                |

       Note: "SRFLX" denotes server-reflexive candidates