SwyxIt! offers various easy ways to forward calls:

Different types of forwarding can be enabled simultaneously. The appropriate forwarding will be automatically used in each case.

When you want to forward a call to an external device you can define a Parallel Call signaling .

With the Call Routing Manager you can also create extensive redirection rules, which are only used under certain conditions (e.g. for calls at a particular time or from a specific number). See also help.enreach.com/cpe/14.00/CRM/Swyx/en-US/index.html#context/help/system_rules_$.