Version 7.2 1197 Mediant 1000B Gateway & E-SBC
User's Manual 65. Configuration Parameters Reference
Parameter Description
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 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 a
nd 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 beh
[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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