User's Manual 1120 Document #: LTRT-27045
Mediant 1000B Gateway & E-SBC
Parameter Description
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 received media. The behaviour is similar to
option [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
LocalISDNRBSource is set to 1.
Note:
 The parameter is applicable only to the Gateway (GW)
application.
 The x in the ini file parameter name denotes the trunk
number, where 0 is Trunk 1.
 The parameter is applicable only to digital interfaces.
Play Ringback Tone to IP
configure voip > sip-definition
Global parameter that enables the device to play a ringback
tone to the IP side for IP-to-Tel calls. You can also configure
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