User's Manual 990 Document #: LTRT-27045
Mediant 1000B Gateway & E-SBC
Parameter Description
response, and the voice channel remains open. However, if the device
did not send a 183 with an SDP and it receives an Alert without PI, the
device sends a 180 (without SDP). If it receives an Alert with PI it
sends a 183with an SDP.
When disabled, the device sends additional 18x responses as a result
of receiving Alerting and Progress messages, regardless of whether or
not a 18x response was already sent.
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).
183 Message Behavior
configure voip > sip-
definition settings > 183-
msg-behavior
[SIP183Behaviour]
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.
[ReleaseIP2ISDNCallOnPro
gressWithCause]
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.
Session-Expires Time
configure voip > sbc settings
> session-expires-time
[SIPSessionExpires]
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).
Note: The parameter is applicable only to the Gateway application.
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