The hotline feature which enables a handset to dial a designated number as soon as the handset is picked up was, previously only available on analogue extensions. From CM 5.2.1 it is now also available on IP handsets when special feature SA8887 is enabled.
First enable the special feature SA8887 page 6.
Configure the abbreviated dial adding the number you want the handset to dial when it is picked up.
In the IP station being used for the hotline feature enter the abbreviated dialing list and then in the hotline destination enter the abbreviated list number and which point it is abbreviated list.
Now when the IP handset is picked up it will automatically dial your designated number.