Ultrative UTT-850, User Manual, Page: 20 / 20

20 -
Set phone sip protocol version.To ensure that the phone can
communicate with CISCO5300 that use SIP1.0
version.You must select RFC2543. Default config is
RFC3261
Enable /disable phone support SIP prack function.
Enable /disable to send register into with authentication
So that UTT -850 needn`t send authentication request to
server each time . so server receive authentication register
info ,it will send register acknowledgement to the
UTT -850
Co-work with Server Auto Swap and Detect Interval Time.
Enable this option, UTT -850 will periodically detect whether
the public SIP server is available, if the server is unavailable, the
UTT -850 will switch to the back-up SIP sever, and continue
detecting the public sip server. UTT -850 will switch back to
the primary SIP server if the server is available again.
Enable /disable to support rfc4028
；
Enable /disable singnal encryption function
Enable /disable voice encryption function
Enable /disable STUN function.
Show stun nat judgement
，
true mean that STUN penetrate
through firewall.
，
false mean that STUN can not penetrate
through firewall.
Set STUN server address
Set SIP STUN serper port
STUN detect NAT type and interval time
Set SIP phone local port