Administration Guide

P a g e | 39
WP820 Administration Guide
Version 1.0.5.5
Remove OBP from
Route
Configures to remove outbound proxy from route. If set to "Enable", the SIP
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".
Enable 100rel
Actives PRACK (Provisional Acknowledgment) method. PRACK improves the
network reliability by adding an acknowledgement to the provisional Responses
(1xx). It is set to “Yes”, the phone will response to the 1xx response from the
remote party. The default setting is "No".
Session Timer
Enable Session
Timer
This parameter is to enable/disable session timer function.
• If set to "Yes", the phone will configure the related parameters when send
session timer according to "Session Expiration".
• If set to "No", disables session timer.
Session
Expiration(s)
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 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.
Min-SE (s)
Determines the minimum session expiration timer (in seconds) if the phone act as
a timer refresher. The default setting is 90. The valid range is from 90 to 64800.
UAC Specify
Refresher
Sets which party will refresh the active session if the phone makes outbound calls.
If it is set to “UAC” and the remote party does not support Refresher feature, the
phone will refresh the active session. If it is set to “UAS”, the remote party will
refresh it. If it is set to “Omit”, the header will be omitted so that it can be selected
by the negotiation mechanism. The default setting is "Omit".
UAS Specify
Refresher
Specifies which party will refresh the active session if the phone receives inbound
calls. If it is set to “UAC”, the remote party will refresh the active session. If it is set
to “UAS” and the remote party does not support refresh feature, the phone will
refresh it.
The default setting is "UAC".
Caller Request Timer
Sets the caller party to act as refresher by force. If set to "Yes" and both party
support session timers, the phone 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".