Question from interview...

[leftyx]

I went on an interview for a CUCM Admin position. I thought I did well but got stumped on a question. I do not have much router experience, and didn't think this specific job required it. But they asked if I knew how to see on the router if, for example, you would troubleshoot how an incoming call on a PRI was coming into your circuit/router...but not going correctly to the phone.

Is there a command to trace an incoming call on a channel? Any help would be appreciated.

 

[leftyx]

Think I answered myself. After some digging...

debug isdn q931

Turning on term mon and that command gives me some great insight to where the call coming in goes to.

 

[rachelle]

What doc did you find that info in? I would like to read up on it. Typically, our Telephony people aren't allowed access to the routers/gateways/switches. If this is something that would be 'required' then, I would like to document it and see if access can be granted.





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[leftyx]

I just kept googling "troubleshooting inbound PRI" and then stumbled on some debug commands. Which lead me to the debug isdn q931 command. It wouldn't show anything at first...but then found I needed to turn on "Terminal monitoring".

Once I did that it showed me real time monitoring of inbound calls to the PRI circuit. Caller ID and called ID were showed along with a bunch of other stuff. Sorry like I said, I do not have much experience with routers, so I cannot speak to what access level it can be granted on. But is very useful if Teleco is claiming they are "sending correct digits" and other claims they make lol.

 

[leftyx]

http://www.cisco.com/c/en/us/suppor...sociated-signaling-cas/9495-isdn-q931-ts.html

Here is something I found ...

 

[gnrslash4life]

Yes, I would use that command as well because it first tells me whether the call is at least coming into the PRI. Then I can go from there.

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