Grandstream Networks WP820 Administration Manual page 21

Local SIP
Defines the local SIP port used to listen and transmit. The default value is 5060 for Account 1 and 5062 for Account 2.
Port
SIP URI
Scheme
Defines which SIP header, "sip" or "sips", will be used if TLS is selected for SIP Transport. The default setting is "sip".
When Using
TLS
Use Actual
Ephemeral Determines the port information in the Via header and Contact header of SIP message when the phone use TCP or TLS. If
Port in set to No, these port numbers will use the permanent listening port on the phone. Otherwise, they will use the ephemeral
Contact with port for the particular connection. The default setting is "No".
TCP/TLS
Support SIP Determines if the phone will send SIP Instance ID. The SIP instance ID is used to uniquely identify the device. If set to
Instance ID "Yes", the SIP Register message Contact header will include +sip.instance tag. The default setting is "Yes".
Defines an estimate of the round-trip time of transactions between a client and server. If no response is received in T1, the
SIP T1
figure will increase to 2*T1 and then 4*T1. The request re-transmit retries would continue until a maximum amount of
Timeout
time define by T2. The default setting is 0.5 sec.
SIP T2 Specifies the maximum retransmit time of any SIP request messages (excluding the SIP INVITE message). The re-
Interval transmitting and doubling of T1 continues until it reaches the T2 value. The default setting is 4 sec.
SIP Timer D Defines the amount of time that the server transaction can remain when unreliable response (3xx-6xx) received. The valid
Interval value is 0-64 seconds. Default value is 0.
SIP Timer B Sets the interval of SIP Timer B. It is used to set the timeout of INVITE transactions and takes effect when Special Feature
Interval is set to Telstra. Default range is 2-128. If set to 0, the parameter will not take effect. The default value is 4s.
SIP Timer F Sets the interval of SIP Timer F. It is used to set the timeout of Non-INVITE transactions and takes effect when Special
Interval Feature is set to Telstra. Default range is 2-128. If set to 0, the parameter will not take effect. The default value is 4s.
Configures to remove outbound proxy from route. If set to "Enable", the SIP account will notify the server to remove the
Remove OBP
proxy in NAT/Firewall environment; If set to "Always", the SIP account will notify the server to remove the proxy
from Route
unconditionally. The default setting is "Disable".
Actives PRACK (Provisional Acknowledgment) method. PRACK improves the network reliability by adding an
Enable
acknowledgement to the provisional Responses (1xx). It is set to "Yes", the phone will response to the 1xx response from
100rel
the remote party. The default setting is "No".
Session
Timer
This parameter is to enable/disable session timer function.
Enable
● If set to "Yes", the phone will configure the related parameters when send session timer according to "Session
Session
Expiration".
Timer
● If set to "No", disables session timer.
Configures the phone'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
Session
once the session interval expires. Session Expiration is the time (in seconds) where the session is considered timed out,
Expiration(s)
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 phone act as a timer refresher. The default setting is
Min-SE (s)
90. The valid range is from 90 to 64800.