Grandstream Networks UCM6206 User Manual page 280

Server User Agent
Send Compact SIP
Headers
•
Never: Whenever ringing occurs, the UCM6200 will send 180 Ringing as long
as 200OK has not been set yet. Inband ringing will not be generated even the
end point device is not working properly.
Configure the user agent string for the UCM6200.
If enabled, compact SIP headers will be sent. The default setting is "No".
UCM6200 Series User Manual
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