Nortel Networks TP-1610 SIP Isdn and CAS Interworking-Related Parameters, EnableTDMoverIP

Mediant 2000 SIP User’s Manual 6. ini File Configuration of the Mediant 2000

6.9ISDN and CAS Interworking-Related Parameters

Note: In Table 6-4, parameters in brackets are the format in the Embedded Web Server *.

Table 6-4: ISDN and CAS Interworking-Related Parameters (continues on pages 111 to 114)

ini File Field Name	Valid Range and Description
Web Parameter Name*
EnableTDMoverIP	0 = Disabled (default).
[Enable TDM Tunneling]	1 = TDM Tunneling is enabled.
	When TDM Tunneling is enabled, the originating Mediant 2000 automatically initiates
	SIP calls from all enabled B-channels belonging to the E1/T1/J1 spans that are
	configured with the ‘Transparent’ protocol. The called number of each call is the internal
	phone number of the B-channel that the call originates from. The IP to Trunk Group
	routing table is used to define the destination IP address of the terminating Mediant
	2000. The terminating Mediant 2000 gateway automatically answers these calls if its
	E1/T1 protocol is set to ‘Transparent’ (ProtocolType = 5).
PlayRBTone2Tel	0 (Don’t play) = The ISDN / CAS gateway doesn’t play a Ringback Tone (RBT). No PI is
[Play Ringback Tone to Tel]	sent to the ISDN, unless the parameter ‘Progress Indicator to ISDN’ is configured
	differently.
	1 (Play) =
	The CAS gateway plays a local RBT to PSTN after receipt of a 180 ringing response
	(with or without SDP).
	Note: Reception of a 183 response doesn’t cause the CAS gateway to play an RBT
	(unless ‘SIP183Behavior = 1’).
	The ISDN gateway functions according to the parameter ‘LocalISDNRBSource’:
	• If the ISDN gateway receives a 180 ringing response (with or without SDP) and
	‘LocalISDNRBSource = 1’, it plays a RBT and sends an Alert with PI = 8 (unless
	the parameter ‘Progress Indicator to ISDN’ is configured differently).
	• If ‘LocalISDNRBSource = 0’, the ISDN gateway doesn’t play an RBT and an Alert
	message (without PI) is sent to the ISDN. In this case, the PBX / PSTN should
	play the RBT to the originating terminal by itself.
	Note: Reception of a 183 response doesn’t cause the ISDN gateway to play an RBT;
	the gateway issues a Progress message (unless ‘SIP183Behavior = 1’).
	If ‘SIP183Behavior = 1’, the 183 response is treated the same way as a 180 ringing
	response.
	2 = Play according to “early media” (default).
	If a 180 response is received and the voice channel is already open (due to a previous
	183 early media response or due to an SDP in the current 180 response), the ISDN /
	CAS gateway doesn’t play the RBT; PI = 8 is sent in an ISDN Alert message (unless the
	parameter ‘Progress Indicator to ISDN’ is configured differently).

If a 180 response is received but the “early media” voice channel is not opened, the CAS gateway plays an RBT to the PSTN; the ISDN gateway functions according to the parameter ‘LocalISDNRBSource’:

•If ‘LocalISDNRBSource = 1’, the ISDN gateway plays an RBT and sends an ISDN Alert with PI = 8 to the ISDN (unless the parameter ‘Progress Indicator to ISDN’ is configured differently).

•If ‘LocalISDNRBSource = 0’, the ISDN gateway doesn’t play an RBT.

No PI is sent in the ISDN Alert message (unless the parameter ‘Progress Indicator to ISDN’ is configured differently). In this case, the PBX / PSTN should play an RBT tone to the originating terminal by itself.

Note: Reception of a 183 response results in an ISDN Progress message (unless ‘SIP183Behavior = 1’).

If ‘SIP183Behavior = 1’ (183 is handled in the same way as a 180+SDP), the gateway sends an Alert message with PI = 8, without playing an RBT.

Version 4.4 111 July 2005