Maximum number of parallel calls:
Int call = 3
PSTN call = 1
VoIP call = 2
VoIPcall + PSTN call = 3 (2 VoIP + 1 PSTN)
VoIP call = external call via SIP account or Gigaset.net
PSTN call = external call via PSTN
Int call = internal call between two handsets
Max. 6 handsets can be registered