AEQ
PHOENIX MERCURY
51
PHOENIX MERCURY includes a STUN client that sends a request to a STUN server. The
STUN server then informs the client of its public IP and which port has been opened by NAT to
permit incoming traffic to enter the client’s network. This information enables the PHOENIX
MERCURY to identify its position within the SIP server. This protocol is used in “AUTO3” and
“AUTO4” NAT TRAVERSAL modes (see section 3.1.5.2.4).
Registration in a STUN Server
Notification from the server of the corresponding NATs detected