Nortel Networks TP-1610 SIP PlayRBTone2IP, ProgressIndicator2ISDN, ProgressIndicator2IP

Mediant 2000 SIP

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*
PlayRBTone2IP	0 = Ringback tone isn’t played (default).
[Play Ringback Tone to IP]	1 = Ringback tone is played (to IP) after SIP 183 session progress response is sent.
	If configured to ‘1’ (Play),
	For IP Tel calls, if a Progress or an Alert message with PI is sent from the ISDN and
	‘EnableEarlyMedia = 1’, the Mediant 2000 opens a voice channel and sends 183
	response. It doesn’t play a Ringback tone to IP (assuming that the Ringback tone is
	played by the ISDN).
	Otherwise, if a voice channel isn’t opened, the Mediant 2000 plays Ringback tone to IP,
	after receiving an Alert message from the ISDN. It sends 183 response, signaling the
	originating party to open a voice channel in order to hear the played Ringback tone.
	Note 1: To enable the gateway to send a 183 response, set ‘EnableEarlyMedia’ to 1.
	Note 2: If ‘EnableDigitDelivery = 1’, the gateway doesn’t play a Ringback tone to IP and
	doesn’t send a 183 response.
ProgressIndicator2ISDN	0, 1 or 8
[Progress Indicator to ISDN]	-1 = Not configured (default).
	If set to "0" PI is not sent to ISDN
	If set to "1" or "8" the PI value is sent to PSTN in Q.931/Proceeding and Alerting
	messages.
	If not configured, the PI in ISDN messages is set according to the "Play Ringback to
	Tel" parameter.
	Usually if PI = 1 or 8, the PSTN/PBX cuts through the audio channel without playing
	local Ringback tone, enabling the originating party to hear remote Call Progress Tones
	or network announcements
ProgressIndicator2IP	-1 = (Not configured) for ISDN spans, the PI that is received in ISDN Proceeding,
[Progress Indicator to IP]	Progress and Alert messages is used as described in the following options (default).
	0 = (No PI) For IP Tel call, the gateway sends “180 Ringing” SIP response to IP after
	receiving ISDN Alert, or (for CAS) after placing a call to PBX/PSTN.
	8, 1 = For IP Tel call, if ‘EnableEarlyMedia=1’, the gateway sends “183 session in
	progress” message + SDP, after a call is placed to PBX/PSTN over the trunk. This is
	used to cut through voice path, before remote party answers the call, enabling the
	originating party to listen to network Call Progress Tones (such as Ringback tone or
	other network announcements).
PIForDisconnectMsg	Defines the gateway’s behavior when a Disconnect message is received from the ISDN
[Set PI in Rx Disconnect	before a Connect message was received.
Message]	-1 (Not configured) = Sends a 183 message according to the received PI in the ISDN
	Disconnect message. If PI = 1 or 8, the gateway sends a 183 response, enabling the
	PSTN to play a voice announcement to the IP side. If there isn’t a PI in the Disconnect
	message, the call is released (default).
	0 = Do not send a 183 message to IP. The call is released.
	1, 8 = Sends 183 message to IP.
ConnectOnProgressInd	0 = Connect message isn’t sent after 183 Session Progress is received (default).
	1 = Connect message is sent after 183 Session Progress is received.
	This feature enables the play of announcements from IP to PSTN without the need to
	answer the Tel	IP call. It can be used with PSTN networks that don’t support the
	opening of a TDM channel before an ISDN Connect message is received.
SIP183Behavior	Defines the ISDN message that is sent when 183 Session Progress message is
[183 Message Behavior]	received for IP	Tel calls.
	0 = Progress message (default).
	1 = Alert message.
	When set to 1, the gateway sends an Alert message (after the receipt of a 183
	response) instead of an ISDN Progress message.
LocalISDNRBSource	Determines whether Ringback tone is played to the ISDN by the PBX / PSTN or by the
[Local ISDN Ringback Tone	gateway.
Source]	0 = PBX / PSTN (default).
	1 = Gateway.
	This parameter is applicable to ISDN protocols. It is used simultaneously with the
	parameter ’PlayRBTone2Tel’.

Mediant 2000 SIP User’s Manual 112 Document #: LTRT-72504