Nortel Networks TP-1610 SIP CngDetectorMode, DefaultReleaseCause, IPAlertTimeout, SIPMaxRtx

Mediant 2000 SIP

Table 6-3: SIP Configuration Parameters (continues on pages 100 to 110)

ini File Field Name		Valid Range and Description
Web Parameter Name*
CngDetectorMode	0 = Don’t detect CNG (default)
[CNG Detector Mode]	2 = Detect CNG on caller side and start fax session (if IsFaxUsed=1)
	Usually T.38 fax session starts when the “preamble” signal is detected by the
	answering side. Some SIP gateways doesn’t’ support the detection of this fax signal on
	the answering side, for these cases it is possible to configure the gateways to start the
	T.38 fax session when the CNG tone is detected by the originating side. However this
	mode is not recommended.
DefaultReleaseCause	Default Release Cause (for IP to Tel calls), used when the gateway initiates a call
[Default Release Cause]	release, and if an explicit matching cause for this release isn’t found, a default release
	cause can be configured. The default release cause is described in the Q.931 notation,
	and translated to corresponding SIP equivalent response value
	The default release cause is: NO_ROUTE_TO_DESTINATION (3).
	Other common values are: NO_CIRCUIT_AVAILABLE (34) or
	DESTINATION_OUT_OF_ORDER (27), etc.
	Note: The default release cause is described in the Q.931 notation, and is translated to
	corresponding SIP 40x or 50x value. For example: 404 for 3, 503 for 34 and 502 for 27.
	For mapping of SIP to Q.931 and Q.931 to SIP release causes, refer to Appendix I on
	page 227.
IPAlertTimeout	Defines the time (in seconds) the gateway waits for a 200 OK response from the called
[Tel to IP No Answer	party (IP side) after sending an Invite message. If the timer expires, the call is released.
Timeout]	The valid range is 0 to 3600. The default value is 180.
SipSessionExpires	0 = Not activate (default)
[Session-Expires Time]	Timeout [seconds] for Keeping a "re-INVITE" message alive within a SIP session
MINSE	Defines the time (in seconds) that is used in the Min-SE header field. This field defines
[Minimum Session-Expires]	the minimum time that the user agent supports for session refresh.
	The valid range is 10 to 100000. The default value is 90.
SIPMaxRtx	Number of UDP retransmissions of SIP messages.
[SIP Maximum Rtx]	The range is 1 to 7.
	The default value is 7.
SipT1Rtx	The time interval (in msec) between the first transmission of a SIP message and the
[SIP T1 Retransmission	first retransmission of the same message.
Timer (msec)]	The default is 500.
	Note: The time interval between subsequent retransmissions of the same SIP message
	starts with SipT1Rtx and is multiplied by two until SipT2Rtx.
	For example (assuming that SipT1Rtx = 500 and SipT2Rtx = 4000):
	The first retransmission is sent after 500 msec.
	The second retransmission is sent after 1000 (2*500) msec.
	The third retransmission is sent after 2000 (2*1000) msec.
	The fourth retransmission and subsequent retransmissions until SIPMaxRtx are sent
	after 4000 (2*2000) msec.
SipT2Rtx	The maximum interval (in msec) between retransmission of SIP messages.
[SIP T2 Retransmission	The default is 4000.
Timer (msec)]	Note: The time interval between subsequent retransmissions of the same SIP message
	starts with SipT1Rtx and is multiplied by two until SipT2Rtx.
EnableEarlyMedia	0 = Early Media is disabled (default).
[Enable Early Media]	1 = Enable Early Media.
	If enabled, the Mediant 2000 gateway sends 183 Session Progress response with SDP
	(instead of 180 ringing), enabling the setup of the media stream prior to the answering
	of the call. Sending 183 response depends on the Progress Indicator. It is sent only if
	PI=1 or PI=8 was received in Proceeding or Alert PRI messages. For CAS gateways
	see the ‘ProgressIndicator2IP’ parameter.
	Note: Generally, this parameter is set to 1.
EnableTransfer	0 = Call transfer is not allowed (default).
[Enable Transfer]	1 = The gateway responds to a Refer message with "Referred To" header to initiates a
	Call Transfer.
Mediant 2000 SIP User’s Manual		106	Document #: LTRT-72504