Park call BLF - on hold with 4 minute reminder timer

Call park with BLF works very well. We setup 8 minute hold time before it returned to original extension. Would like ring notification after 4 minutes to remind extension it hard a call. Also how to set indefinite call holding with Call park (BLF). Please look into this feature. Avaya, panasonic and several older PBX systems have this feature. Once a customer using this feature they want it on all their future phone systems. 


Using Yealink T27G phone's 


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