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Field Name
Explanation
Enable DNS SRV
Enables use of DNS SRV records
Use VPN
Enable SIP use VPN for every line individually, not all of them
Transport
Protocol
Configuration using the transport protocol, TCP, TLS or UDP, the default is UDP.
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
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
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.
