haier D1200P - Manual (Page 49)

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Call forward is a network service.
This service is used to forward incoming calls to your voice mail system or to
another number depending on certain conditions in which your phone is
unavailable or you don't want to receive any call.
3.5.1.1 Unconditional
This function will unconditionally forward all incoming calls to voice mail or other
number.
3.5.1.2 When busy
This option will forward incoming calls when you are on a call.
3.5.1.3 Not reply/Not reachable
This function will forward incoming calls if you don't answer the call or your
phone is out of network service or switched off.
If your mobile phone service provider supports this feature, the call waiting
notifies you of an incoming call even while you are on a call. You can accept,
reject, or ignore the incoming call.
The Call Waiting function needs to be supported by your network service
provider.
3.5.2 Call waiting