Basically he wants to forward a call to a parallel hunt group to 3 external numbers.
Bad description and not much sense in it however:considering that 2000 is the HG number and it containing extensions 3000, 4000 and 5000.
Normal behavior as documented in the sys doc.However the hunt group seems to overide any forwards!
Configure a ghost-Z extension. Configure 3 remote extensions 7001, 7002, 7003 (+3 remote ghost-Z sets 6001, 6002, 6003 --> see configuration for remote extensions in sys doc)
Configure the ghost Z extension in the overflow address of the hunt group (for internal calls). Configure ghost-Z as distribution for an entity that you will assign to the hunt group (for external calls overflow distribution).
Configure set supervision (of the ghost extension 6000) for on all 3 remote extensions and tick take supervision at off hook (7001, 7002, 7003).
You need license for 3 remote extensions (REX).