DND off Code is 79 by default.
⚫ Return Code When Refuse: select code to be sent to the caller side via SIP
server when you rejected the incoming call.
9.3.2. Speed Dial Call
Speed Dial is used to quickly initiate the pre-configured numbers by pressing
Dial key. You can create up to 8 numbers on FT600(K). To do the configuration
on the web Intercom > Basic > Speed Dial interface.
9.3.3. Robin Call
Robin call is used to initiate multiple numbers from one family in Fasttel
Fasttelphone APP one by one. If the previous callee does not answer within the
robin call timeout, the call will be transferred to the next one. If the call is
answered by one of the callees, the call will not be transferred anymore. This
feature is only available when connecting to Fasttelphone app. To do the
configuration on the web Intercom > Basic > Robin Call interface.