SIP User's Manual 722 Document #: LTRT-83310
Mediant 600 & Mediant 1000
Parameter Description
the PSTN. This is applicable only if the call is released from the IP
[Busy Here (486) or Not Found (404)] before it reaches the Connect
state; otherwise, the Disconnect message is sent immediately and
no tones are played.
Note: This parameter is applicable only to digital PSTN interfaces.
Web: Play Ringback Tone
to Trunk
[PlayRBTone2Trunk_ID]
Determines the playing method of the ringback tone to the trunk side
per trunk, where ID denotes the trunk number and where 0 is the first
trunk.
[-1] Not configured = The settings of the PlayRBTone2Tel parameter
is used (default).
[0] Don't Play = When the device is configured for ISDN / CAS, it
doesn't play a ringback tone. No Progress Indicator (PI) is sent to the
ISDN unless the ProgressIndicator2ISDN_ID parameter is
configured differently.
[1] Play on Local = When the device is configured for CAS, it plays a
local ringback tone to the PSTN upon receipt of a SIP 180 Ringing
response (with or without SDP). Note that the receipt of a SIP 183
response does not cause the device configured for CAS to play a
ringback tone (unless the SIP183Behaviour parameter is set to 1).
When the device is configured for ISDN, it operates according to the
LocalISDNRBSource parameter, as follows:
If the device receives a SIP 180 Ringing response (with or
without SDP) and the LocalISDNRBSource parameter is set to
1, it plays a ringback tone and sends an ISDN Alert with PI = 8
(unless the ProgressIndicator2ISDN_ID parameter is configured
differently).
If the LocalISDNRBSource parameter is set to 0, the device
doesn't play a ringback tone and an Alert message without PI is
sent to the ISDN. In this case, the PBX / PSTN plays the
ringback tone to the originating terminal. Note that the receipt of
a 183 response does not cause the device to play a ringback
tone; the device sends a Progress message (unless
SIP183Behaviour is set to 1). If the SIP183Behaviour parameter
is set to 1, the 183 response is handled the same way as a 180
Ringing response.
[2] Prefer IP = Plays according to 'Early Media'. If a SIP 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 device configured for ISDN / CAS doesn't play
the ringback tone; PI = 8 is sent in an ISDN Alert message (unless
the ProgressIndicator2ISDN_ID parameter is configured differently).
If a 180 response is received, but the 'early media' voice channel is
not opened, the device configured for CAS plays a ringback tone to
the PSTN. The device configured for ISDN operates according to the
LocalISDNRBSource parameter:
If LocalISDNRBSource is set to 1, the device plays a ringback
tone and sends an ISDN Alert with PI = 8 to the ISDN (unless
the ProgressIndicator2ISDN_ID parameter is configured
differently).
If LocalISDNRBSource is set to 0, the device doesn't play a
ringback tone. No PI is sent in the ISDN Alert message (unless
the ProgressIndicator2ISDN_ID parameter is configured
differently). In this case, the PBX / PSTN plays a ringback tone
to the originating terminal. Note that the receipt of a 183
response results in an ISDN Progress message (unless
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