AudioCodes Mediant 1000B User Manual page 941

User's Manual
Parameter
Trunk
CLI: play-rbt-to-trk
[PlayRBTone2Trunk_x]
Version 6.8
per trunk.

[-1] Not configured = (Default) The settings of the PlayRBTone2Tel
parameter is used.

[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_x 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_x 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_x 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_x 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_x 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
SIP183Behaviour is set to 1). If SIP183Behaviour is set to 1
(183 is handled the same way as a 180 with SDP), the device
sends an Alert message with PI = 8 without playing a ringback
tone.

[3] Play Local Until Remote Media Arrive = Plays tone according to
941
51. Configuration Parameters Reference
Description
Mediant 1000B Gateway & SBC