AudioCodes Mediant 2000 User Manual page 261

SIP User's Manual
Parameter
Web/EMS: Enable Early 183
[EnableEarly183]
Web: 183 Message Behavior
EMS: SIP 183 Behaviour
[SIP183Behaviour]
Web: Session-Expires Time
EMS: Sip Session Expires
[SIPSessionExpires]
Web: Minimum Session-Expires
EMS: Minimal Session Refresh
Value
[MinSE]
Web/EMS: Session Expires
Method
[SessionExpiresMethod]
[RemoveToTagInFailureRespo
nse]
Version 6.0
Determines whether the device sends a SIP 183 response with
SDP to the IP immediately upon receipt of an INVITE message
(for IP-to-Tel calls). The device sends the RTP packets only once
it receives an ISDN Progress, Alerting with Progress indicator, or
Connect message from the PSTN.

[0] Disable (default)

[1] Enable
For example, if enabled and the device receives an ISDN
Progress message, it starts sending RTP packets according to
the initial negotiation without sending the 183 response again.
Therefore, this feature reduces clipping of early media.
Notes:

To enable this feature, configure the EnableEarlyMedia
parameter to 1.

This feature is applicable only to ISDN interfaces.
Defines the ISDN message that is sent when the 183 Session
Progress message is received for IP-to-Tel calls.

[0] Progress = The device sends a Progress message.
(default).

[1] Alert = The device sends an Alerting message (upon
receipt of a 183 response) instead of an ISDN Progress
message. .
Determines the numerical value that is sent in the Session-
Expires header in the first 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).
Defines the time (in seconds) that is used in the Min-SE header.
This header defines the minimum time that the user agent
refreshes the session.
The valid range is 10 to 100,000. The default value is 90.
Determines the SIP method used for session-timer updates.

[0] Re-INVITE = Uses Re-INVITE messages for session-timer
updates (default).

[1] UPDATE = Uses UPDATE messages.
Notes:

The device can receive session-timer refreshes using both
methods.

The UPDATE message used for session-timer is excluded
from the SDP body.
Determines whether the device removes the 'to' header tag from
final SIP failure responses to INVITE transactions.

[0] = Do not remove tag (default).

[1] = Remove tag.
261
6. Configuration Parameters Reference
Description
March 2010