Coherent way to trace calls through ISDN q931 debugs?
Here is a snippet from a test call I made:
JESSE: Search through the debug for the call you are interested in. I usually search for a calling or called number to get started. Once you find it scroll up a few lines and you should see the inbound setup message. Remember the terms inbound and outbound are from the perspective of the router. “Inbound <---” from the circuit or “Outbound --->” to the circuit.
072179: Nov 8 17:01:38.445 EST: ISDN Se0/1/0:23 Q931: RX <- SETUP pd = 8 callref = 0x01DF
Bearer Capability i = 0x8090A2
Standard = CCITT
Transfer Capability = Speech
Transfer Mode = Circuit
Transfer Rate = 64 kbit/s
Channel ID i = 0xA18381
Preferred, Channel 1
Calling Party Number i = 0x2183, '5126582024'
Called Party Number i = 0x80, '0555'
JESSE: Make note of the callref id, this is how we will track our call. In this case the INBOUND callref id is 0x01DF. The outbound callref id will be the same except 0x0 will be replaced with 0x8
JESSE: Here you can see we send a call proceeding message back out to the circuit. (ringing)
072181: Nov 8 17:01:38.449 EST: ISDN Se0/1/0:23 Q931: TX -> CALL_PROC pd = 8 callref = 0x81DF
Channel ID i = 0xA98381
Exclusive, Channel 1
JESSE: When the call pickups on our end we send a message letting the circuit know we have connected and they respond with an acknowledgement.
072182: Nov 8 17:01:38.917 EST: ISDN Se0/1/0:23 Q931: TX -> CONNECT pd = 8 callref = 0x81DF
072183: Nov 8 17:01:38.953 EST: ISDN Se0/1/0:23 Q931: RX <- CONNECT_ACK pd = 8 callref = 0x01DF
072184: Nov 8 17:01:38.957 EST: %ISDN-6-CONNECT: Interface Serial0/1/0:0 is now connected to 5126582024 N/A
JESSE:In this case I hung up on my end first so you see the circuit telling us with an inbound message to tear down the call. If the user on our end hung up first you would see the opposite with us sending an outbound message.
072189: Nov 8 17:01:50.445 EST: ISDN Se0/1/0:23 Q931: RX <- DISCONNECT pd = 8 callref = 0x01DF
Cause i = 0x8090 - Normal call clearing
072190: Nov 8 17:01:50.445 EST: %ISDN-6-DISCONNECT: Interface Serial0/1/0:0 disconnected from 5126582024 , call lasted 11 seconds
072191: Nov 8 17:01:50.445 EST: ISDN Se0/1/0:23 Q931: TX -> RELEASE pd = 8 callref = 0x81DF
072192: Nov 8 17:01:50.469 EST: ISDN Se0/1/0:23 Q931: RX <- RELEASE_COMP pd = 8 callref = 0x01DF
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