Version 5.2 81 September 2007
SIP User's Manual 5. Web-based Management
Table 5-8: General Parameters (Protocol Definition)
Parameter Description
Play Ringback Tone to IP
[PlayRBTone2IP]
 [0] Don't Play = Ringback tone isn't played to the IP side
of the call (default).
 [1] Play = Ringback tone is played to the IP side of the call
after SIP 183 session progress response is sent.
If configured to 1 ('Play'), and if EnableEarlyMedia = 1, for IP-
to-Tel calls the gateway may play a ringback tone to IP,
according to the following:
 For CAS interfaces, the gateway opens a voice channel,
sends a 183+SDP response and plays a Ringback tone to
IP.
 For ISDN interfaces, if a Progress or an Alert message
with PI (1 or 8) is received from the ISDN, the gateway
opens a voice channel, sends a 183+SDP or 180+SDP
response, but it doesn't play a Ringback tone to IP. If PI (1
or 8) is received from the ISDN, the gateway assumes that
Ringback tone is played by the ISDN Switch. Otherwise,
the fateway plays a Ringback tone to IP after receiving an
Alert message from the ISDN. It sends a 180+SDP
response, signaling to the originating party to open a voice
channel to hear the played Ringback tone.
Notes:
 To enable the gateway to send a 183/180+SDP
responses, set EnableEarlyMedia to 1.
 If EnableDigitDelivery = 1, the gateway doesn't play a
Ringback tone to IP and doesn't send 183 or 180+SDP
responses.
Play Ringback Tone to Tel
[PlayRBTone2Tel]
Determines the method used to play Ringback tone to the Tel
side. It applies to all trunks that are not configured by the
parameter PlayRBTone2Trunk. Similar description as the
parameter PlayRBTone2Trunk.
Use Tgrp Information
[UseSIPTgrp]
 [0] Disable = Tgrp parameter isn't used (default).
 [1] Send Only = The trunk group number is added as the
'tgrp' parameter to the Contact header of outgoing SIP
messages. If a trunk group number is not associated with
the call, the 'tgrp' parameter isn't included. If a 'tgrp' value
is specified in incoming messages, it is ignored.
 [2] Send and Receive = The functionality of outgoing SIP
messages is identical to the functionality described in
option (1). In addition, for incoming SIP messages, if the
Request-URI includes a 'tgrp' parameter, the gateway
routes the call according to that value (if possible). If the
Contact header includes a 'tgrp' parameter, it is copied to
the corresponding outgoing messages in that dialog.
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