AudioCodes Mediant 1000B User Manual page 940

Parameter
Web: Play Ringback Tone to
User's Manual
1, it plays a ringback tone and sends an ISDN Alert with PI = 8
(unless the ProgressIndicator2ISDN_x parameter is configured
differently).
2) 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 configured for
ISDN to play a ringback tone; the device issues 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 = (Default):

Analog Interfaces: Plays a ringback tone to the Tel side only if
a 180/183 response without SDP is received. If 180/183 with
SDP message is received, the device cuts through the voice
channel and doesn't play the ringback tone.

Digital Interfaces: 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:
1) 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).
2) 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 + SDP), the device
sends an Alert message with PI = 8, without playing a ringback
tone.

[3] Play Local Until Remote Media Arrive = Plays a ringback tone
according to received media. The behaviour is similar to [2]. 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 plays a local ringback
tone if there are no prior received RTP packets. The device stops
playing the local ringback tone as soon as it starts receiving RTP
packets. At this stage, if the device receives additional 18x
responses, it does not resume playing the local ringback tone. Note
that for ISDN trunks, this option is applicable only if the
LocalISDNRBSource parameter is set to 1.
Note: This parameter is applicable to the Gateway and IP-to-IP
applications.
Determines the playing method of the ringback tone to the trunk side,
940
Mediant 1000B Gateway & SBC
Description
Document #: LTRT-27034