Grandstream Networks WP820 Administration Manual page 37

Use
Specifies if the P-Preferred-Identity Header will be presented in the SIP INVITE
P-Preferred-Identity message. If set to "default", the P-Preferred-Identity Header will be omitted in SIP
Header
INVITE message when "Huawei IMS" special feature is active. If set to "Yes", the
P-Preferred-Identity Header will always be presented. If set to "No", it will be
omitted. The default setting is "Default".
SIP Transport Determines the network protocol used for the SIP transport. Users can choose
from TCP/UDP/TLS. Default setting is "UDP".
Local SIP Port Defines the local SIP port used to listen and transmit. The default value is 5060
for Account 1 and 5062 for Account 2.
SIP URI Scheme
Defines which SIP header, "sip" or "sips", will be used if TLS is selected for SIP
When Using TLS
Transport. The default setting is "sip".
Use Actual
Determines the port information in the Via header and Contact header of SIP
Ephemeral Port in
message when the phone use TCP or TLS. If set to No, these port numbers will
Contact with
use the permanent listening port on the phone. Otherwise, they will use the
TCP/TLS
ephemeral port for the particular connection.
The default setting is "No".
Support SIP Instance
Determines if the phone will send SIP Instance ID. The SIP instance ID is used to
ID uniquely identify the device. If set to "Yes", the SIP Register message Contact
header will include +sip.instance tag. The default setting is "Yes".
SIP T1 Timeout 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.
SIP T2 Interval
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.
SIP Timer D Interval
Defines the amount of time that the server transaction can remain when
unreliable response (3xx-6xx) received. The valid value is 0-64 seconds. Default
value is 0.
Remove OBP from
Configures to remove outbound proxy from route. If set to "Enable", the SIP
Route
account will notify the server to remove the proxy in NAT/Firewall environment; If
set to "Always", the SIP account will notify the server to remove the proxy
unconditionally. The default setting is "Disable".
WP820 Administration Guide
Version 1.0.1.15
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37