AudioCodes Mediant 800B MSBR User Manual page 324

Parameter
Web: Progress Indicator to IP
CLI: prog-ind-to-ip
[IpProfile_ProgressIndicator2IP]
Mediant 800B MSBR
Description
messages with the PI.

CAS: See the ProgressIndicator2IP parameter.

ISDN: Sending a 183 response depends on the
ISDN PI. It is sent only if PI is set to 1 or 8 in the
received Proceeding or Alerting PRI messages.
Sending 183 response also depends on the
ReleaseIP2ISDNCallOnProgressWithCause
parameter, which must be set to any value other
than 2.

See also the IgnoreAlertAfterEarlyMedia parameter.
This parameter allows, for example, to interwork Alert
with PI to SIP 183 with SDP instead of 180 with SDP.

You can also configure early SIP 183 response
immediately upon the receipt of an INVITE, using the
EnableEarly183 parameter.

Analog: To send a 183 response, you must also set the
ProgressIndicator2IP parameter to 1. If set to 0, a 180
Ringing response is sent.

The corresponding global parameter is
EnableEarlyMedia.
Defines the progress indicator (PI) sent to the IP.

[-1] Not Configured = (Default)

Analog: Default values are used (1 for FXO
interfaces and 0 for FXS interfaces).

Digital ISDN: The PI received in ISDN Proceeding,
Progress, and Alerting messages is used, as
described in the options below.

[0] No PI =

Analog: For IP-to-Tel calls, the device sends a 180
Ringing response to IP after placing a call to a
phone (FXS) or PBX (FXO).

Digital: For IP-to-Tel calls, the device sends 180
Ringing response to the IP after receiving an ISDN
Alerting or (for CAS) after placing a call to the
PBX/PSTN.

[1] PI = 1:

Analog: For IP-to-Tel calls, if the
EnableEarlyMedia parameter is set to 1, the device
sends a 183 Session Progress message with SDP
immediately after a call is placed to a phone/PBX.
This is used to cut-through the voice path before
the remote party answers the call. This allows the
originating party to listen to network call progress
tones such as ringback tone or other network
announcements.

Digital: For IP-to-Tel calls, if the parameter
EnableEarlyMedia is set to 1, the device sends
180 Ringing with SDP in response to an ISDN
Alerting or it sends a 183 Session Progress
message with SDP in response to only the first
received ISDN Proceeding or Progress message
after a call is placed to PBX/PSTN over the trunk.

[8] PI = 8: same as PI = 1.
324
Mediant 800B MSBR
Document #: LTRT-12813