Welltech IP Centrex 6850 V.1.5 - Manual (Page 21)

Welltech Computer Co., Ltd.
IP Centrex 6850 21
retransmission continue but at an interval of T2. (Default Value: 4000)
Retransmission T4: T4 represents the amount of time the network takes to
clear message between client and server transactions as defined in
RFC3261. For example, when working with an unreliable transport protocol,
T4 determines the time that UAS waits after receiving an ACK message
and before terminating the transaction. (Default Value: 5000)
Invite Linger Timer: After sending an ACK for an INVITE final response, a
client cannot be sure that the server has received the ACK message; the
client should be able to retransmit the ACK upon receiving retransmissions
of the final response for inviteLingerTimer milliseconds.
General Linger Timer: After a server sends a final response, the server
cannot be sure that the client has received the response message. The
server should be able to retransmit the response upon receiving
retransmissions of the request for generalLingerTimer milliseconds.
(Default Value: 32000)
Provisional Timer: When a client receives a provisional response, it
continues to retransmit the request, but with an interval of provisionalTimer
milliseconds.
Cancel General No Response Timer: When sending a CANCEL request on
a General transaction, the User Agent waits
cancelGeneralNoResponseTimer milliseconds before timeout termination if
there is no response for the cancelled transaction.
Cancel Invite No Response Timer: When sending a CANCEL request on a
Invite transaction, the User Agent waits cancelInviteNoResponseTimer
milliseconds before timeout termination if there is no response for the
cancelled transaction.
General Request Timeout Timer: After sending a General request, the User
Agent waits for a final response generalRequestTimeoutTimer milliseconds
before timeout termination (in this time the User Agent retransmits the
request every T1, 2*T1,…T2,…milliseconds)
Send 487 When Recv CANCEL: When receive CANCEL form remote site,
send “487 Request canceled”or not