+-------------------------------+  +-------------------------------+
|   Alice      +--------------+ |  | +--------------+       Bob    |
|              | Offer/Answer | |  | | Offer/Answer |              |
| +--------+   |    Module    | |  | |    Module    |   +--------+ |
| |  ICE   |   +--------------+ |  | +--------------+   |  ICE   | |
| | Module |         |          |  |        |           | Module | |
| +--------+         |          |  |        |           +--------+ |
+-------------------------------+  +-------------------------------+
      |              |                      |                |
      |              |    INVITE (Offer)    |                |
      |              |--------------------->|                |
      |              |     183 (Answer)     |                |
      |              |<---------------------|                |
      |              |                      |                |
      |                                                      |
      |             SIP INFO (more candidates)               |
      |----------------------------------------------------->|
      |             SIP INFO (more candidates)               |
      |<-----------------------------------------------------|
      |                                                      |
      |          STUN Binding Requests/Responses             |
      |----------------------------------------------------->|
      |          STUN Binding Requests/Responses             |
      |<-----------------------------------------------------|
      |                                                      |