2N BRI Lite/Enterprise v1.8 - Manual (Page 109)

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Layer 4 Message Status
ID Name Description
0 NULL Rest status, ready for call
1 MORE
Call request received from GSM or ISDN, awaiting further dialling or
timeout
2 SETUP Call request sent to opposite interface
3 PROC Call request confirmed, awaiting call answer
4 ACTIVE Connected call
5 DISC Call disconnection in progress