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6-8
Linksys SPA9000 Administrator Guide
Document Version 3.01
Chapter 6 SPA9000 Field Reference
SIP Tab
SIP Timer Values (sec)
Hook Flash MIME Type MIME Type used in a SIP INFO message to signal a hook flash event.
The default is application/hook-flash.
Remove Last Reg Lets you remove the last registration before registering a new one if the value is different.
Select yes or no from the drop-down menu.
The default is no.
Use Compact Header Lets you use compact SIP headers in outbound SIP messages. Select yes or no from the
drop-down menu. If set to yes, the SPA9000 uses compact SIP headers in outbound SIP
messages. If set to no, the SPA9000 uses normal SIP headers. If inbound SIP requests
contain compact headers, SPA9000 reuses the same compact headers when generating the
response regardless the settings of the <Use Compact Header> parameter. If inbound SIP
requests contain normal headers, SPA9000 substitutes those headers with compact
headers (if defined by RFC 261) if <Use Compact Header> parameter is set to yes.
The default is no.
Escape Display Name Lets you keep the Display Name private. Select yes if you want the SPA9000 to enclose
the string (configured in the Display Name) in a pair of double quotes for outbound SIP
messages. Any occurrences of or \ in the string is escaped with \ and \\ inside the pair of
double quotes. Otherwise, select no.
The default is no.
RFC 2543 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.
The default is yes.
SIP TCP Port Min Specifies the lowest TCP port number that can be used for SIP sessions.
SIP TCP Port Max Specifies the highest TCP port number that can be used for SIP sessions.
CTI Enable Enables or disables the Computer Telephone Interface feature provided by some servers.
Field Description
SIP T1 RFC 3261 T1 value (RTT estimate), which can range from 0 to 64 seconds.
The default is.5.
SIP T2 RFC 3261 T2 value (maximum retransmit interval for non-INVITE requests and INVITE
responses), which can range from 0 to 64 seconds.
The default is 4.
SIP T4 RFC 3261 T4 value (maximum duration a message remains in the network), which can
range from 0 to 64 seconds.
The default is 5.