2.1.2 Network call states

The call states that may exist on the network side of the user-network interface are defined in this subclause.

2.1.2.1 Null state (N0)

2.1.2.2 Call initiated (N1)

2.1.2.3 Overlap sending (N2)

2.1.2.4 Outgoing call proceeding (N3)

2.1.2.5 Call delivered (N4)

2.1.2.6 Call present (N6)

2.1.2.7 Call received (N7)

2.1.2.8 Connect request (N8)

2.1.2.9 Incoming call proceeding (N9)

2.1.2.10 Active (N10)

2.1.2.11 Disconnect request (N11)

2.1.2.12 Disconnect indication (N12)

2.1.2.13 Suspend request (N15)

2.1.2.14 Resume request (N17)

2.1.2.15 Release request (N19)

2.1.2.16 Call abort (N22)

2.1.2.17 Overlap receiving (N25)