Stun Settings - Plantronics IP40 Administration Manual

present use it, otherwise use option 66.
Web Page: Network Settings
Label on web page: Boot Server Options
Parameter name: NETWORK_DHCP_CLIENT_BOOT_SERVER_OPTION
Type: integer (150 to 254)
Default Value: 160
Notes: This is the numeric value of any custom DHCP option code used to reference the
configuration server. For example, by default DHCP option code 160 would be used if it
is present.
Web Page: Network Settings
Label on web page: Boot Server Option Type
Parameter name: NETWORK_DHCP_CLIENT_BOOT_SERVER_OPTION_DATATYPE
Type: enumeration
Default Value: 1 (String)
Notes: 0 = 4 binary octets of an IP address; 1 = String. Some DHCP implementations
convey an IP address as 4 octets in a DHCP option. Other implementations convey a
string which can be a string representation of an IP address or a domain name. The
string representation is more common.

6.5.3 STUN Settings

NAT Traversal
If the IP40 headset adapter is used on a private network while the SIP registrar, proxy
server, and other endpoints (for example gateways) are accessed via the public
Internet, some NAT traversal technique will need to be used to make sure that IP
addresses and port numbers needed for RTP media are useful to the receiver (they
need to be translated by the IP40 headset adapter or an intermediary), that the
addresses and ports used for SIP traffic are useful to at least the adapter's proxy server,
and that the NAT binding between the adapter and its SIP proxy remains open.
Currently there are a variety of NAT traversal techniques, STUN, TURN and ICE
Factors affecting whether a specific approach will work include what type or types of
NATs are being used, the topology of the network, whether any intermediaries attempt
NAT-related adjustments, and whether the other parties are also behind a NAT.
For firewall traversal the IP40 uses STUN. The IP40 provides a STUN client to contact
a STUN server (usually on the public Internet) to find out what the IP address and port
number is likely to be after its address is translated by a NAT. The IP40 headset
adapter can also determine the amount of time before NAT bindings expire by
repeatedly trying to contact itself through the STUN server at various intervals. The
STUN NAT traversal technique will usually work if the IP40 headset adapter is behind a
5/29/2009 Plantronics IP40 Administration Guide Page 37