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defined in RFC3261. For example, when an unreliable transport protocol
is used, general requests are retransmitted at an interval which starts at
T1 and doubles until reaches T2. If a provisional response is received,
retransmission continue but at an interval of T2. (Default Value: 4000ms)
**
SIP T4 (msec): 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 this timer. This timer is also
used when a 2xx response is sent for an incoming Invite. In this case, the
ACK is not part of the Invite transaction.
General Linger Timer: After a UAS sends a final response, the UAS
cannot be sure that the client has received the response message. The
UAS should be able to retransmit the response upon receiving
retransmissions of the request based on this timer.
Cancel General No Response Time (msec): When sending a CANCEL
request on a General transaction, the User Agent waits cancel General
No Response Timer milliseconds before timeout termination if there is no
response for the cancelled transaction(Default Value: 10000ms).**
General Request Timeout Timer (msec): After sending a General
request, the User Agent waits for a final response general Request
Timeout Timer milliseconds before timeout termination (in this time the
User Agent retransmits the request every T1,
2*T1,...T2,...milliseconds)**
Cancel Invite No Response Timer (msec): When sending a
CANCEL request on an Invite request, the User Agent waits this timer
before timeout termination if there is no response for the cancelled
transaction.
Provisional Timer (msec): The provisionalTimer is set when receiving
a provisional response on an INVITE transaction. The transaction will
stop retransmissions of the INVITE request and will wait for a final
response until the provisionTimer was expired. If you set the
provisionTimer to 0, no timer is set. The INVITE transaction will wait
indefinitely for the final response.
First Response Timer (msec): When sending a request out, the User
Agent waits this timer for any response received from UAS. If timer is
expired and no any SIP message is received, the User Agent will think
the request is failed. The default is 5 seconds.
MWI Subscript Expires (sec): You can Enable or Disable the MWI
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