AudioCodes Mediant 500L User Manual page 1071

User's Manual
Parameter
183 Message Behavior
configure voip > sip-
definition settings > 183-
msg-behavior
[SIP183Behaviour]
[ReleaseIP2ISDNCallOnPro
gressWithCause]
Session-Expires Time
configure voip > sbc settings
Version 7.2
messages, i.e., a ring tone, busy tone or recorded announcement
played to the ISDN side) and an Alerting message is then received
from the ISDN side (with or without Progress Indicator), the device
also sends a 180 Ringing response to the caller. Therefore, in this
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 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.
Defines the numerical value sent in the Session-Expires header in the
first SIP INVITE request or response (if the call is answered).
1071
69. Configuration Parameters Reference
Description
Mediant 500L Gateway & E-SBC