See below for a list with supported features behind the Yeastar P-series PBX.

Feature                                       P710/P810(B)/P82X/P85X(B)WN670/N870Maxwell B/2/3/4
Minimum software release:  10.1.198.162.39.03.18.1
Basic Callyesyesyes
Calling line (CLIP)yesyesyes
Connected line (COLP)yesyesyes
Anonymous callPBX featurePBX featurePBX feature
Do Not Disturbyesyesyes
Message waitingyesyesyes
Call list/historyyesyes (local)yes
Voice mail deposit/retrievalyesyesyes
Call waitingyesyesyes
Call Hold / Toggleyesyesyes
Music on Holdyesyesyes
Call forward (CFU)yesyesyes
Call forward (CFNR)yesyesyes
Call forward (CFB)yesyesyes
Call Transfer attendedyesyesyes
Call Transfer unattendedyesyesyes
Call Transfer blindyesyesyes
DTMF (RFC2833)yesyesyes
Conference 3ptyyesyesyes
BLF Busy / Idle indicationyesN.A.yes
Call pick-up direct  ( * 04 extension)yesyesyes
Call pick-up group ( * 4 )yesyesyes
Call pick-up BLFyesN.A.yes
Call completed elsewhereyesyesyes
Auto provisioningyesyesyes
Firmware update via PBX / provisioning
yesyes

See the following wiki articles about auto-provisioning and configuration of the Gigaset devices.