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6
SIP Parameters
You can use the VoIP > Advanced VoIP Setup > SIP Parameters menu to configure particular aspects of the
Session Initiation Protocol (SIP) implementation. The menu items include:
•
SIP Protocol Parameters
•
SIP Response Codes
•
SIP Distinctive Ring Names
•
SIP Protocol Timers
SIP Protocol Parameters
Parameter Description Default
SIP Require User Name
Enables or disables a requirement that an
incoming INVITE include a SIP user name
assigned to the VoIP subsystem in an
active account.
Disabled
SIP Local Port (1024-65535)
Local UDP port used for sending/
receiving SIP call control messages. This
port can be mapped by a firewall.
5060
SIP Public External IP Address
Forces a specific external IP address for
SIP messages sent
0.0.0.0 (Disabled)
SIP Public External Port
Forces a specific external UDP port for
SIP messages sent
0 (Disabled)
TOS Value (0x00 – 0xff)
Type of service (TOS) value or DIFFServ
DSFIELD used for SIP message
68 (DIFFSRV
Expedited
Forwarding)
SIP Accept Language String
Specifies the language for user-viewable
messages used in the SIP accept
message
English
SIP Send Response to SRC Port
Respond to the sender’s IP address/UDP
port used by SIP request message
Enabled
SIP Max Forwards
Maximum forward value 15
SIP Ringing Retransmit
Enables or disables retransmission Enabled
SIP Use NAT Discovery
Enable use of NAT discovery procedures
to obtain an external IP address/UDP port
mapping for SIP messages
Enabled
SIP Use Received Via Info
Use VIA header IP address/UDP port
parameters in received messages as
external IP address/UDP port
Disabled
Chapter 6: SIP Parameters 21