Cisco Systems SPA9000 manual SIP Timer Values sec, Field

		Chapter 6 SPA9000 Field Reference
	SIP Tab
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.

SIP Timer Values (sec)

Field

SIP T1

SIP T2

SIP T4

Description

RFC 3261 T1 value (RTT estimate), which can range from 0 to 64 seconds. The default is.5.

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.

RFC 3261 T4 value (maximum duration a message remains in the network), which can range from 0 to 64 seconds.

The default is 5.

	Linksys SPA9000 Administrator Guide
6-8	Document Version 3.01