AudioCodes Mediant 800 User Manual page 1305

CHAPTER 72 Configuration Parameters Reference
Parameter
Retransmission Parameters
'SIP T1 Retransmission
Timer'
configure voip >
sip-definition
settings > t1-re-
tx-time
[SipT1Rtx]
'SIP T2 Retransmission
Timer'
configure voip >
sip-definition
settings > t2-re-
tx-time
[SipT2Rtx]
'SIP Maximum RTX'
configure voip >
sip-definition
settings > sip-max-
rtx
[SIPMaxRtx]
'Number of RTX Before
Hot-Swap'
configure voip >
sip-definition
proxy-and-
registration > nb-
of-rtx-b4-hot-swap
[HotSwapRtx]
configure voip > sip-
definition settings >
message-policy-reject-
response-type
■ The parameter is applicable only to FXS interfaces.
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.
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.
Defines the maximum number of UDP transmissions of SIP
messages (first transmission plus retransmissions).
The range is 1 to 30. The default is 7.
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
Defines the SIP response code that the device sends when it
rejects an incoming SIP message due to a matched Message
Policy in the Message Policies table, whose 'Send Reject'
(MessagePolicy_SendRejection) parameter is configured to
Policy Reject [0].
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Mediant 800 Gateway & E-SBC | User's Manual
Description
Connectivity.