[cisco-voip] ISDN Q931 Question

[Mark Holloway]

It means your Telco provider sent a disconnect to your router. 

Can you debug the entire call?  Normally it looks like this:

Caller sends a SETUP to the Switch.
If the SETUP is OK, the switch sends a CALL PROCeeding to the Caller, and then a SETUP to the Receiver.
The Receiver gets the SETUP. If it is OK, then it rings the phone and sends an ALERTING message to the Switch.
The Switch forwards the ALERTING message to the Caller.
When the receiver answers the call, is sends a CONNECT message to the Switch
The Switch forwards the CONNECT message to the Caller.
The Caller sends a CONNECT ACKnowledge message to the Switch
The Switch forwards the CONNECT ACK message to the Receiver.
Done. The connection is now up.


On Oct 27, 2011, at 9:44 AM, steve.siltman at assurant.com wrote:

> Hello VoIP Friends. 
> 
> I want to verify I'm reading this debug correctly before I throw everything I have at Telco.  Intermittent calls are getting disconnected during the conversation mid-sentence.  Every one of these that are reported, I match up the CM traces with the debug.  I see the call comes in with the below SETUP message and I use the callref = to find when the call ended.   All calls say Normal call clearing.  Does the RX <- DISCONNECT mean that either Telco or the customer hung up first? 
> 
> Oct 27 05:01:00.644: ISDN Se0/1/1:15 Q931: RX <- SETUP pd = 8  callref = 0x0003 
> Oct 27 05:02:03.174: ISDN Se0/1/1:15 Q931: RX <- DISCONNECT pd = 8  callref = 0x0003 
> Cause i = 0x8090 - Normal call clearing 
> 
> 
> I'm also assuming that TX -> DISCONNECT means our side hung up the call first. 
> 
> and last question.  What does RX <- RELEASE mean? 
> 
> Thanks a ton! 
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