Grandstream Networks HT-286 Syslog Level, Session Expiration, Min-SE, Caller Request Timer

	Syslog Level	Select the ATA to report the log level. Default is NONE. The level is one of
		DEBUG, INFO, WARNING or ERROR. Syslog messages are sent based on
		the following events:
		• product model/version on boot up (INFO level)
		• NAT related info (INFO level)
		• sent or received SIP message (DEBUG level)
		• SIP message summary (INFO level)
		• inbound and outbound calls (INFO level)
		• registration status change (INFO level)
		• negotiated codec (INFO level)
		• Ethernet link up (INFO level)
		• SLIC chip exception (WARNING and ERROR levels)
		• memory exception (ERROR level)
		The Syslog uses USER facility. In addition to standard Syslog payload, it
		contains the following components:
		GS_LOG: [device MAC address][error code] error message
		Here is an example: May 19 02:40:38 192.168.1.14 GS_LOG:
		[00:0b:82:00:a1:be][000] Ethernet link is up
	Session Expiration	Grandstream implemented SIP Session Timer. The session timer extension
		enables SIP sessions to be periodically “refreshed” via a re-INVITE request.
		Once the session interval expires, if there is no refresh via a re-INVITE
		message, the session will be terminated.
		Session Expiration is the time (in seconds) at which the session is considered
		timed out, if no successful session refresh transaction occurs beforehand.
		The default value is 180 seconds.
	Min-SE	The minimum session expiration (in seconds). The default value is 90
		seconds.
	Caller Request Timer	If selecting “Yes” the phone will use session timer when it makes outbound
		calls if remote party supports session timer.
	Callee Request Timer	If selecting “Yes” the phone will use session timer when it receives inbound
		calls with session timer request.
	Force Timer	If selecting “Yes” the phone will use session timer even if the remote party
		does not support this feature. Selecting “No” will allow the phone to enable
		session timer only when the remote party support this feature.
		To turn off Session Timer, select “No” for Caller Request Timer, Callee
		Request Timer, and Force Timer.
	UAC Specify	As a Caller, select UAC to use the phone as the refresher, or UAS to use the
	Refresher	Callee or proxy server as the refresher.
	UAS Specify	As a Callee, select UAC to use caller or proxy server as the refresher, or
	Refresher	UAS to use the phone as the refresher.
	Force INVITE	Session Timer can be refreshed using INVITE method or UPDATE method.
		Select “Yes” to use INVITE method to refresh the session timer.
Grandstream Networks, Inc.		HT–286 User Manual	Page 23 of 28
		Firmware 1.1.0.31	Last Updated: 1/2009