AudioCodes Mediant 1000B User Manual page 1066

Parameter
183 Message Behavior
configure voip > sip-
definition settings > 183-
msg-behavior
[SIP183Behaviour]
[ReleaseIP2ISDNCallOnPro
gressWithCause]
Session-Expires Time
configure voip > sbc settings
> session-expires-time
[SIPSessionExpires]
User's Manual
case, early media is played to the ISDN side and then the ringback
tone is played by the IP PBX.

[1] = Enable. If the device sends a 183 response with SDP (due to
a received ISDN Progress or Proceeding with PI messages) and
an Alerting message is then received from the ISDN side (with or
without Progress Indicator), the device does not send a 180
Ringing response to the caller and the voice channel remains
open. Therefore, in this case, early media is played to the ISDN
side and a ringback tone is not played by the IP PBX.
Note:

The parameter is applicable only to digital interfaces.

The parameter is applicable only if the EnableEarlyMedia
parameter is set to 1 (i.e., enabled).
Digital: Defines the ISDN message that is sent when the 183 Session
Progress message is received for IP-to-Tel calls.
Analog: Defines the response of the device upon receipt of a SIP 183
response.

[0] Progress = (Default)

Digital: The device sends a Progress message.

Analog: A 183 response (without SDP) does not cause the
device to play a ringback tone.

[1] Alert =

Digital: The device sends an Alerting message (upon receipt of
a 183 response) instead of an ISDN Progress message.

Analog: 183 response is handled by the device as if a 180
Ringing response is received, and the device plays a ringback
tone.
Note: The parameter is applicable only to the Gateway application.
Typically, if an Q.931 Progress message with a Cause is received
from the PSTN for an outgoing IP-to-ISDN call and the
EnableEarlyMedia parameter is set to 1 (i.e., the Early Media feature
is enabled), the device interworks the Progress to 183 + SDP to
enable the originating party to hear the PSTN announcement about
the call failure. Conversely, if EnableEarlyMedia is set to 0, the device
disconnects the call by sending a SIP 4xx response to the originating
party. However, if the ReleaseIP2ISDNCallOnProgressWithCause
parameter is set to 1, then the device sends a SIP 4xx response even
if the EnableEarlyMedia parameter is set to 1.

[0] = (Default) If a Progress with Cause message is received from
the PSTN for an outgoing IP-to-ISDN call, the device does not
disconnect the call by sending a SIP 4xx response to the
originating party.

[1] = The device sends a SIP 4xx response when the
EnableEarlyMedia parameter is set to 0.

[2] = The device always sends a SIP 4xx response, even if he
EnableEarlyMedia parameter is set to 1.
Note: The parameter is applicable only to digital interfaces.
Defines the numerical value sent in the Session-Expires header in the
first SIP INVITE request or response (if the call is answered).
The valid range is 1 to 86,400 sec. The default is 0 (i.e., the Session-
Expires header is disabled).
1066
Mediant 1000B Gateway & E-SBC
Description
Document #: LTRT-27055