Grandstream Networks WP820 Administration Manual page 22

Ephem the ephemeral port for the particular connection. The default setting is "No".
eral
Port in
Contac
t with
TCP/T
LS
Suppor
Determines if the phone will send SIP Instance ID. The SIP instance ID is used to uniquely identify the device. If set
t SIP
Instanc to "Yes", the SIP Register message Contact header will include +sip.instance tag. The default setting is "Yes".
e ID
SIP T1 Defines an estimate of the round-trip time of transactions between a client and server. If no response is received in
Timeo T1, the figure will increase to 2*T1 and then 4*T1. The request re-transmit retries would continue until a maximum
ut amount of 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-
Interva
transmitting and doubling of T1 continues until it reaches the T2 value. The default setting is 4 sec.
l
SIP
Timer
Defines the amount of time that the server transaction can remain when unreliable response (3xx-6xx) received.
D
The valid value is 0-64 seconds. Default value is 0.
Interva
l
SIP
Sets the interval of SIP Timer B. It is used to set the timeout of INVITE transactions and takes effect when Special
Timer
B 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.
Interva
l
SIP
Sets the interval of SIP Timer F. It is used to set the timeout of Non-INVITE transactions and takes effect when
Timer
F Special 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.
Interva
l
Remov
Configures to remove outbound proxy from route. If set to "Enable", the SIP account will notify the server to
e OBP
remove the proxy in NAT/Firewall environment; If set to "Always", the SIP account will notify the server to remove
from
the proxy unconditionally. The default setting is "Disable".
Route
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
100rel
response from the remote party. The default setting is "No".
Sessio
n
Timer
This parameter is to enable/disable session timer function.
Enable
Sessio
● If set to "Yes", the phone will configure the related parameters when send session timer according to "Session
n
Expiration".
Timer
● If set to "No", disables session timer.
Sessio Configures the phone's SIP session timer. It enables SIP sessions to be periodically "refreshed" via a SIP request
n (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