Grandstream Networks BT200 사용자 설명서

 

Grandstream Networks, Inc. 

Page 28 of 37  

Last Updated:  12/2006

 

 

The SIP Session Timer extension enables SIP sessions to be periodically 
“refreshed” via a SIP request (UPDATE, or re-INVITE. Once the session interval 
expires, if there is no refresh via a UPDATE or re-INVITE message, the session is 
terminated.  
 
Session Expiration is the time (in seconds) at which the session is considered timed 
out, provided no successful session refresh transaction occurs beforehand. The 
default value is 180 seconds. 

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.  

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. 

As a Caller, select UAC to use the phone as the refresher, or UAS to use the Callee 
or proxy server as the refresher.  

As a Callee, select UAC to use caller or proxy server as the refresher, or UAS to 
use the phone as the refresher. 

Session Timer can be refreshed using INVITE method or UPDATE method. Select 
“Yes” to use INVITE method to refresh the session timer.  

The use of the PRACK (Provisional Acknowledgment) method enables reliability to 
be offered to SIP provisional responses (1xx series). This is very important if PSTN 
internetworking is to be supported. A user’s wish to use reliable provisional 
responses is invoked by the 100rel tag which is appended to the value of the 
required header of initial signaling messages. 

There are 4 different ring tone that are defined: 
System Ring Tone:  when selected, all calls will ring with system ring tone. 
Customer Ring Tone 1 to 3: when selected, BT200  will ONLY play this ring tone for 
all the incoming calls for this account. 

If this parameter is set to “Yes”, the “From” header in outgoing INVITE message will 
be set to anonymous, essentially blocking the Caller ID from displaying. 

When set to “Yes”, BT200 will automatically switch to speaker when there is an 
incoming call. 

Default is No. If set to Yes, auto answer depends on the Call-Info in the SIP 
message. This feature needs the support of IP-PBX. 

Default is No. If set to Yes, the speaker will turn off, and the phone will go back to 
idle status, after the other party of the call hands up.