Channel Parameters - AudioCodes Mediant 4000 SBC User Manual

CHAPTER 60 Configuration Parameters Reference
Parameter
[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
[MessagePolicyReject
ResponseType]

Channel Parameters

This section describes the device's channel parameters.
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 Connectivity.
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].
The default is 400 "Bad Request".
To configure Message Policies, see
Policy Rules.
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Mediant 4000 SBC | User's Manual
Description
Configuring SIP Message