User's Manual 1016 Document #: LTRT-27045
Mediant 1000B Gateway & E-SBC
Parameter Description
definition settings > t1-re-tx-
time
[SipT1Rtx]
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.
Note: The parameter is also used for alternative routing (see
''Alternative Routing Based on IP Connectivity'' on page 492.
SIP Message Manipulations Table
Message Manipulations
configure voip > message
message-manipulations
[MessageManipulations]
Defines manipulation rules for SIP header messages.
The format of the ini file table parameter is as follows:
[ MessageManipulations]
FORMAT MessageManipulations_Index =
MessageManipulations_ManSetID,
MessageManipulations_MessageType,
MessageManipulations_Condition,
MessageManipulations_ActionSubject,
MessageManipulations_ActionType,
MessageManipulations_ActionValue,
MessageManipulations_RowRole;
[\MessageManipulations]
For example, the below configuration changes the user part of the SIP
From header to 200:
MessageManipulations 1 = 0, Invite.Request, , Header.From.Url.User,
2, 200, 0;
For a detailed description of the table, see Configuring SIP Message
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