SIP User's Manual 724 Document #: LTRT-83310
Mediant 600 & Mediant 1000
Parameter Description
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 configured for ISDN / CAS
doesn't play the ringback tone; PI = 8 is sent in an ISDN Alert
message (unless the ProgressIndicator2ISDN_ID 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:
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_ID 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_ID 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.
Note: This parameter is applicable to the Gateway and IP-to-IP
applications.
Web: Play Ringback Tone
to IP
EMS: Play Ring Back Tone
To IP
[PlayRBTone2IP]
Determines whether the device plays a ringback tone to the IP side for
IP-to-Tel calls.
[0] Don't Play = Ringback tone isn't played (default).
[1] Play = Ringback tone is played after SIP 183 session progress
response is sent.
For digital modules: If configured to 1 ('Play') and EnableEarlyMedia is
set to 1, the device plays a ringback tone according to the following:
For CAS interfaces: the device opens a voice channel, sends a
183+SDP response, and then plays a ringback tone to IP.
For ISDN interfaces: if a Progress or an Alerting message with PI (1
or 8) is received from the ISDN, the device opens a voice channel,
sends a 183+SDP or 180+SDP response, but doesn't play a
ringback tone to IP. If PI (1 or 8) is received from the ISDN, the
device assumes that ringback tone is played by the ISDN switch.
Otherwise, the device plays a ringback tone to IP after receiving an
Alerting message from the ISDN. It sends a 180+SDP response,
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