Nortel Networks Mediant TP-1610 SIP - Manual (Page 112)

Mediant 2000 SIP
Mediant 2000 SIP User’s Manual 112 Document #: LTRT-72504
Table 6-4: ISDN and CAS Interworking-Related Parameters (continues on pages 111 to 114)
ini File Field Name
Web Parameter Name
*
Valid Range and Description
PlayRBTone2IP
[Play Ringback Tone to IP] 0 = Ringback tone isn’t played (default).
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
[Progress Indicator to ISDN] 0, 1 or 8
-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
[Progress Indicator to IP] -1 = (Not configured) for ISDN spans, the PI that is received in ISDN Proceeding,
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
[Set PI in Rx Disconnect
Message]
Defines the gateway’s behavior when a Disconnect message is received from the ISDN
before a Connect message was received.
-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
[183 Message Behavior] Defines the ISDN message that is sent when 183 Session Progress message is
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
[Local ISDN Ringback Tone
Source] Determines whether Ringback tone is played to the ISDN by the PBX / PSTN or by the
gateway.
0 = PBX / PSTN (default).
1 = Gateway.
This parameter is applicable to ISDN protocols. It is used simultaneously with the
parameter ’PlayRBTone2Tel’.