D-Link DPH-400S User Manual page 53

Field name
Simple Traversal of
UDP through NATs
(STUN) Settings
STUN NAT Traversal
Server Address
Server Port
Blinding Period
SIP Waiting Time
Sip Line Using STUN
Choose line to set info about SIP, There are 4 lines to choose. You can switch
by 【Load】 button.
STUN
explanation
Shows STUN NAT Transverse estimation, true
means STUN can penetrate NAT, while False
means not.
Set your SIP STUN Server IP address.
Set your SIP STUN Server Port.
Set STUN blinding period(s). If NAT server finds
that a NAT mapping is idle after time out, it will
release the mapping and the system need send a
STUN packet to keep the mapping effective and
alive.
Specify the sip wait stun time; you can input the
time depended on your network condition.