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Authentication name The name used for the Realm authentication. This may be the
same as the user name, but must be filled in.
Registration Interval
This is a request to the SIP server for when the registration
should expire. OmniTouch 4135 IP automatically renews the
registration within the time interval if the phone is still on and
connected to the server. The default value is 1800 seconds.
Proxy 1
Shall contain the proxy server used for Internet communication,
if any. Can be left blank.
Proxy 2
Outbound proxy
Survivability enabled
Survivability server
On phone:
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(6,2,1).
Nat traversal
NAT (
Network Address Translation
) is a firewall or router function that operates by
rewriting the IP addresses in the IP headers as packets pass from one interface to the
other. When a packet, for example, is sent from the inside, the source IP address and
port are rewritten from the private IP address space into the address space on the
outside (Internet).
NAT rewrites the addresses but leaves the packages themselves untouched. This kind of
translation works fine for many protocols, but causes a lot of trouble for SIP packages
UIBUDPOUBJOBEESFTTJOGPSNBUJPOJOUIFJSDPOUFOU GPSFYBNQMFBO*/7*5&SFRVFTUGSPN
one IP address to another).
NAT traversal solves this problem, providing a “view from the outside” that makes it
possible to replace the IP address in the SIP requests with the address shown on the
other side of the firewall.
Note that in some cases NAT traversal is not necessary. Some public service providers
of IP telephony keep track of the actual IP address used to register a phone, and the
one used in the SIP requests from the same phone, and then replaces the addresses in
the SIP messages.
STUN
STUN (
Simple Traversal of UDP through NATs
) is a protocol that
assists devices behind a NAT firewall or router with their packet
routing. STUN is commonly used in real-time voice, video, mes-
saging, and other interactive IP communication applications..
The protocol allows applications operating through a NAT to
discover the presence and specific type of NAT and obtain the
mapped (public) IP address (NAT address) and port number
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