SIP IP Phone
VIP-256T
Name
If this is not specified, the <SIP User Agent Name> is also used for the RE
GISTER request. Defaults to blank
Max Auth
Maximum number of times (from 0 to 255) a request may be challenged.
Default is 2.
Make ALL AVT
Package
For second dial tone, enable this item package by making the position to 1,
but 0 for disabling this item.
RFC 254.3 Call Hold
If set to yes, unit will include c=0.0.0.0 syntax in SDP when sending a SIP
re-INVITE to the peer to hold the call. If set to no, unit will not include the c
=0.0.0.0 syntax in the SDP.
The unit will always include a=sendonly syntax in the SDP in either case.
Defaults to yes
SRTP
Enable/Disable SRTP(Secure Real-time Transport Protocol)
SRTP Prefer
Encryto
SRTP encryption type.
NAT Setting
Set your NAT Traversal parameters in the following interface. It is helpful for the device behind NAT.
Item
Descriptions
NAT Traversal
Enable/Disable NAT.
VIP-256T supports STUN traversal. Choose “STUN” in the “NAT
Traversal Mode” if you want traverse NAT/Firewall.
STUN Server IP
STUN server IP address, default is stun.fwdnet.net
NAT Refresh Interval (sec)
the interval to refresh
Port
STUN port
26
