ISDN Layer 3
Name
Name According to
Q.931
NT Description TE Description
NULL Null Rest status, ready for call
CINIT Call Initiated Call from PRI indicated Call to PRI started
OVSEND Overlap Sending Gradual dialling receiving
Gradual dialling
sending
OPROC
Outgoing Call
Proceeding
Dialling from PRI
terminated
Dialling to PRI
terminated
CDELIV Call Delivered Call from PRI ringing Call to PRI ringing
CPRES Call Present Call to PRI started Call from PRI indicated
CRECV Call Received Call to PRI ringing Call from PRI ringing
CONREQ Connect Request Call to PRI answered
Call from PRI
answered
IPROC
Incoming Call
Proceeding
Dialling to PRI terminated
Dialling from PRI
terminated
ACTIVE Active Connected call
DISREQ Disconnect Request End of call from PRI End of call to PRI
DISIND Disconnect Indication End of call to PRI End of call from PRI
RELREQ Release Request Channel release request
OVRECV Overlap Receiving Gradual dialling sending
Gradual dialling
receiving
RSTREQ Restart Request
Channel restart request
sent
RSTART Restart
Channel restart request
received
ISDN Layer Management Statuses
INIT – Initialisation upon PRI board reset
IDLE – Activation – rest status, necessary for layers 2 and 3
DISC – Deactivation
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