This is high-level overview of an ISDN call.

Call Setup

993697mS ISDNL3Tx: v=0 peb=5
            ISDN Layer3 Pcol=08(Q931) Reflen=2 ref=0011(Remote)
            Message Type = Setup
                InformationElement = BearerCapability
             0000 04 03 80 90 a2                  
                InformationElement = CHI
             0000 18 03 a9 83 97               
            InformationElement = CallingPartyNumber
             0000 6c 0c 00 80 33 30 33 35 35 35 31 32 30 34       
                InformationElement = CalledPartyNumber
             0000 70 0b 80 37 32 30 34 34 34 35 32 33 37          

Call Handling Information

993737mS ISDNL3Rx: v=0 peb=5
            ISDN Layer3 Pcol=08(Q931) Reflen=2 ref=0011(Local)
            Message Type = CallProceeding
                InformationElement = CHI
            0000 18 03 a9 83 97= use B channel 23          

Phone rings on the other side

993746mS ISDNL3Rx: v=0 peb=5
            ISDN Layer3 Pcol=08(Q931) Reflen=2 ref=0011(Local)
            Message Type = Alerting

The other side answers the call

1005111mS ISDNL3Rx: v=0 peb=5
            ISDN Layer3 Pcol=08(Q931) Reflen=2 ref=0011(Local)
            Message Type = Connect
                InformationElement = PI
            0000 1e 02 81 82                             
                InformationElement = Shift 6
                InformationElement = ??(28)
            0000 28 0e 31 73 74 20 32 20 77 69 72 73 20 44 43 50

Speech path established

 1005112mS ISDNL3Tx: v=0 peb=5
            ISDN Layer3 Pcol=08(Q931) Reflen=2 ref=0011(Remote)
            Message Type = ConnectAck

Call disconnected

 1007058mS ISDNL3Rx: v=0 peb=5
            ISDN Layer3 Pcol=08(Q931) Reflen=2 ref=0011(Local)
            Message Type = Disconnect
                InformationElement = 
            0000 08 02 81 90=Cause code 90=Normal call clearing    

Channel Released by provider

 1007059mS ISDNL3Tx: v=0 peb=5
            ISDN Layer3 Pcol=08(Q931) Reflen=2 ref=0011(Remote)
            Message Type = Release

Channel free for new use

 1007077mS ISDNL3Rx: v=0 peb=5
            ISDN Layer3 Pcol=08(Q931) Reflen=2 ref=0011(Local)
            Message Type = ReleaseComplete

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