Chapter 12 The Service Configuration Screens
User’s Guide 135
12.2.1 Advanced SIP Settings
This section describes the features of the Advanced SIP settings screen.

12.2.1.1 STUN

STUN (Simple Traversal of User Datagram Protocol (UDP) through Network
Address Translators) allows the WiMAX Modem to find the presence and types of
NAT routers and/or firewalls between it and the public Internet. STUN also allows
the WiMAX Modem to find the public IP address that NAT assigned, so the WiMAX
Modem can embed it in the SIP data stream. STUN does not work with symmetric
NAT routers or firewalls. See RFC 3489 for details on STUN.
The following figure shows how STUN works.
1The WiMAX Modem (A) sends SIP packets to the STUN server (B).
2The STUN server (B) finds the public IP address and port number that the NAT
router used on the WiMAX Modem’s SIP packets and sends them to the WiMAX
Modem.
3The WiMAX Modem uses the public IP address and port number in the SIP packets
that it sends to the SIP server (C).

Figure 57 STUN Example

12.2.1.2 Outbound Proxy

Your VoIP service provider may host a SIP outbound proxy server to handle all of
the WiMAX Modem’s VoIP traffic. This allows the WiMAX Modem to work with any
type of NAT router and eliminates the need for STUN or a SIP ALG. Turn off a SIP
ALG on a NAT router in front of the WiMAX Modem to keep it from re-translating
the IP address (since this is already handled by the outbound proxy server).

12.2.1.3 Voice Coding

A codec (coder/decoder) codes analog voice signals into digital signals and
decodes the digital signals back into voice signals. The WiMAX Modem supports
the following codecs.

A

B

C

NAT

1