User's Manual 67. Configuration Parameters Reference
Version 6.8 973 Mediant 500L MSBR
Parameter Description
(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
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.
Notes:
This parameter is applicable only to the Gateway (GW) application
(i.e., not the IP-to-IP application).
The x in the ini file parameter name denotes the trunk number,
where 0 is Trunk 1.
This parameter is applicable only to digital PSTN interfaces.
Web: Play Ringback Tone to
Global parameter that enables the device to play a ringback tone to
the IP side for IP-to-Tel calls. You can also configure this functionality
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