Htek UC912E, Руководство пользователя

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Basic Call Features
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4. Enter the phone number in the Value field.
Note: if the person that wanted to be spoken to do not want to answer the call, then
the person that answered the coming call could use this function.
Transfer Release Trigger
This option defines when the phone sends BYE to the server to release the transferred
call.
1. NOTIFY with 200OK
After receiving REFER request sended by the phone, server will send NOTIFY to
the phone, and the phone response 200OK, this is the trigger for the phone to release
the call.
2. 2xx response of REFER
The phone will not release the call until it receives a 2xx response from the server to
the phone's REFER request.
3. BYE for the call
The phone will not release the call until receiving BYE from the server.