10.25.2.2. Call on Hold 
- A station can put a call on hold, without initiating consultation call, with the following consequences:
- after placing a call on hold, the station can pick-up an incoming call instead of initiating a consultation call.
- Consultation call of a DSS 1 terminal is evaluated as a normal basic call (CPS station prefix)
- A consultation call on a DSS1 terminal cannot be picked up, only transferred using ECT.
- The demand that the held party can also hold a connection results
in the following:
- transfer by release is no longer possible.
- Station transfer security is not longer possible (automatic recall on no answer using ECT is still supported).