23
Protocol
Enable Rport
Enable/Disable support for NAT traversal via RFC3581 (Rport).
Keep
Authentication
Enable /disable registration with authentication. It will use the last authentication
field which passed authentication by server. This will decrease the load on the
server if enabled
Enable PRACK
Enable or disable SIP PRACK function. Default is OFF. It is suggested this be used.
Ans. With a Single
Codec
If enabled phone will respond to incoming calls with only one codec.
Enable Strict
Proxy
Enables the use of strict routing. When the phone receives packets from the server
it will use the source IP address, not the address in via field.
Auto TCP
Force the use of TCP protocol to guarantee usability of transport for SIP messages
above 1500 bytes
Enable DNS SRV
Enables use of DNS SRV records
SIP Global Settings
Strict Branch
Enable Strict Branch - The value of the branch must be after”z9hG4bK” in the VIA
field of the INVITE message received, or the phone will not respond to the INVITE.
Note: This will affect all lines
Enable Group
Enable SIP Group Backup. This will affect all lines
Enable RFC4475
Enable or disable RFC4475,default is enable
。
Registration
Failure Retry Time
Registration failures retry time – If registrations fails, the phone will attempt to
register again after registration failure retry time. This will affect all lines
Enable Strict UA
Match
Enable or disable Strict UA Match
DND Return Code
Specify SIP Code returned for DND. Default is 480 - Temporarily Not Available.
Reject Return
Code
Specify SIP Code returned for Rejected call. Default is 603 – Decline.
Busy Return Code
Specify SIP Code returned for Busy. Default is 486 – Busy Here.
b) STUN
STUN – Simple Traversal of UDP through NAT –A STUN server allows a phone in a private network to
know its public IP and port as well as the type of NAT being used. The
equipment
can then use this
information to register itself to a SIP server so that it can make and receive calls while in a private
network.
