Nortel Networks Mediant TP-1610 SIP - Manual (Page 111)

Mediant 2000 SIP User’s Manual 6. ini File Configuration of the Mediant 2000
Version 4.4 111 July 2005
6.9 ISDN 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
Web Parameter Name
* Valid Range and Description
EnableTDMoverIP
[Enable TDM Tunneling] 0 = Disabled (default).
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
[Play Ringback Tone to Tel] 0 (Don’t play) = The ISDN / CAS gateway doesn’t play a Ringback Tone (RBT). No PI is
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.