Grandstream Networks GSC3516 User Manual page 26

SIP T1 Timeout
SIP T2 Timeout
SIP Timer D Interval
Outbound Proxy Mode
Enable 100rel
Enable Session Timer
Session Expiration
Min-SE
Caller Request Timer
Callee Request Timer
Force Timer
UAC Specify Refresher
UAS Specify Refresher
Defines an estimate of the round-trip time of transactions between a client and server. If no
response is received in T1, the figure will increase to 2*T1 and then 4*T1. The request re-transmit
retries would continue until a maximum amount of time define by T2. The default setting is 0.5
sec.
Specifies the maximum retransmit time of any SIP request messages (excluding the SIP INVITE
message). The re-transmitting and doubling of T1 continues until it reaches the T2 value. The
default setting is 4 sec.
Defines the amount of time that the server transaction can remain when unreliable response (3xx-
6xx) received. The valid value is 0-64 seconds.
The default value is 0.
Configures whether to put the Outbound Proxy in the Route header, or if SIP messages should
always be sent to Outbound Proxy.
Actives PRACK (Provisional Acknowledgment) method. PRACK improves the network reliability
by adding an acknowledgement system to the provisional Responses (1xx). It is set to "Yes", the
device will response to the 1xx response from the remote party. Default is "No".
Session Timer
Allows the device to use the session timer, when set to "Yes", it will be added in the SIP INVITE
message to notify the server.
Configures the device's SIP session timer. It enables SIP sessions to be periodically "refreshed" via
a SIP request (UPDATE, or re-INVITE). If there is no refresh via an UPDATE or re-INVITE
message, the session will be terminated once the session interval expires.
Session Expiration is the time (in seconds) where the session is considered timed out, provided no
successful session refresh transaction occurs beforehand.
The default setting is 180. The valid range is from 90 to 64800.
Determines the minimum session expiration timer (in seconds) if the device act as a timer
refresher. Default is 90. The valid range is from 90 to 64800.
Sets the caller party to act as refresher by force. If set to "Yes" and both party support session
timers, the device will enable the session timer feature when it makes outbound calls. The SIP
INVITE will include the content "refresher=uac". The default setting is "No".
Sets the callee party to act as refresher by force. If set to "Yes" and the both parties support session
timers, the device will enable the session timer feature when it receives inbound calls. The SIP 200
OK will include the content "refresher=uas". The default setting is "No".
Configures the session timer feature on the device by force.
● If it is set to "Yes", the device will use the session timer even if the remote party does not
support this feature.
● If set to "No", the device will enable the session timer only when the remote party supports this
feature. To turn off the session timer, select "No".
The default setting is "No".
As a caller, select UAC to use the device as the refresher, or select UAS to use the callee or proxy
server as the refresher. When set to "Omit", the refresh object is not specified.
As a callee, select UAC to use caller or proxy server as the refresher, or select UAS to use the
device as the refresher.