AudioCodes Mediant 2000

User's Manual 656 Document #: LTRT-68822
Mediant 2000
Parameter Description
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_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:

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).

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 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.
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 = (Default) Ringback tone isn't played.
 [1] Play = Ringback tone is played after SIP 183 session
progress response is sent.
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