CHAPTER68 Configuration Parameters Reference
Mediant 1000 Gateway & E-SBC | User's Manual
Parameter Description
✔ 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
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 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.
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