AudioCodes Mediant 1000 User Manual page 722

Parameter
Web: Play Ringback Tone
to Trunk
[PlayRBTone2Trunk_ID]
SIP User's Manual
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.
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
722
Mediant 600 & Mediant 1000
Description
Document #: LTRT-83310