User's Manual 1118 Document #: LTRT-27045
Mediant 1000B Gateway & E-SBC
Parameter Description
parameter (which defines ringback tone per Trunk).
 [0] Don't Play =
Analog Interfaces: Ringback tone is not played.
Digital Interfaces: The device doesn't play a ringback
tone. No PI is sent to the PSTN unless the
ProgressIndicator2ISDN_x parameter is configured
differently.
 [1] Play on Local =
Analog Interfaces: Plays a ringback tone to the Tel side
of the call when a SIP 180/183 response is received.
Digital Interfaces:
CAS: The device 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 183 response
does not cause the device to play a ringback tone
(unless the SIP183Behaviour parameter is set to 1).
ISDN: The device operates according to the
LocalISDNRBSource parameter:
1) If the device receives a 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).
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 respons
the device doesn't play the ringback tone; PI = 8 is sent
in an ISDN Alert message (unless the
ProgressIndicator2ISDN_x parameter is configured
differently).
CAS: If a 180 response is received, but the 'early media'
voice channel is not opened, the device plays a ringback
tone to the PSTN.
ISDN: The device 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
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