AudioCodes Mediant 800B - Page 1153

Version 7.2 1153 Mediant 800B Gateway & E-SBC
User's Manual 72. Configuration Parameters Reference
Parameter Description
Out-Of-Service Behavior
configure voip > sip-
definition settings > oos-
behavior
[FXSOOSBehavior]
Determines the behavior of FXS endpoints when a Busy Out condition
exists.
 [0] None = Silence is heard when the FXS endpoint goes off-hook.
 [1] Reorder Tone = (Default) The device plays a reorder tone to the
connected phone / PBX.
 [2] Polarity Reversal = The device reverses the polarity of the
endpoint making it unusable (relevant, for example, for PBX DID
lines).
 [3] Reorder Tone + Polarity Reversal = Same as options [1] and [2].
 [4] Current Disconnect = The device disconnects the current to the
FXS endpoint.
Note:
 A device reset is required for the parameter to take effect when it is
set to [2], [3], or [4].
 The parameter is applicable only to FXS interfaces.
Retransmission Parameters
SIP T1 Retransmission
Timer
configure voip > sip-
definition settings > t1-re-tx-
time
[SipT1Rtx]
Defines the time interval (in msec) between the first transmission of a
SIP message and the first retransmission of the same message.
The default is 500.
Note: The time interval between subsequent retransmissions of the
same SIP message starts with SipT1Rtx. For INVITE requests, it is
multiplied by two for each new retransmitted message. For all other
SIP messages, it is multiplied by two until SipT2Rtx. For example,
assuming SipT1Rtx = 500 and SipT2Rtx = 4000:
 The first retransmission is sent after 500 msec.
 The second retransmission is sent after 1000 (2*500) msec.
 The third retransmission is sent after 2000 (2*1000) msec.
 The fourth retransmission and subsequent retransmissions until
SIPMaxRtx are sent after 4000 (2*2000) msec.
SIP T2 Retransmission
Timer
configure voip > sip-
definition settings > t2-re-tx-
time
[SipT2Rtx]
Defines the maximum interval (in msec) between retransmissions of
SIP messages (except for INVITE requests).
The default is 4000.
Note: The time interval between subsequent retransmissions of the
same SIP message starts with SipT1Rtx and is multiplied by two until
SipT2Rtx.
SIP Maximum RTX
configure voip > sip-
definition settings > sip-
max-rtx
[SIPMaxRtx]
Defines the maximum number of UDP transmissions of SIP messages
(first transmission plus retransmissions).
The range is 1 to 30. The default is 7.
Number of RTX Before Hot-
Swap
configure voip > sip-
definition proxy-and-
registration > nb-of-rtx-b4-
hot-swap
[HotSwapRtx]
Defines the number of retransmitted INVITE/REGISTER messages
before the call is routed (hot swap) to another Proxy/Registrar.
The valid range is 1 to 30. The default is 3.
For example, if configured to 3 and no response is received from an IP
destination, the device attempts another three times to send the call to
the IP destination. If still unsuccessful, it attempts to redirect the call to
another IP destination.