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6 
SIP Parameters 
You can use the VoIP > Advanced VoIP Setup > SIP Parameters menu to configure particular aspects of the 
S
ession Initiation Protocol (SIP) implementation. The menu items include: 
• 
• 
• 
• 
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
                                                                                                                             
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