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New Member

debug isdn q931 on gateway question

Hi all. Im in the process of staging a new install and Im just trying to verify that digits are being sent over to my new gateway. I have it all configured and I have debug isdn q931 on, but Im not seeing the call trying to go through the router. Now, I do not have the PRI plugged in, I only have a T1 loop in to get a green CD light on the VWIC card. Im thinking I should be able to at least see the call trying to go out, even though it wont because of the loop back plug I have in it. Is this correct? I think I have everything set up correctly on the CUCM, the same as I have done it many times before, but Im just not seeing the digits come across to the gateway. I guess my question is if I dont have the PRI in place, would I see the digits come across to the gateway?

29 REPLIES

Re: debug isdn q931 on gateway question

I guess the most important question is if the gateway is mgcp or H323. If it is mgcp is the endpoint registered with the call manager? If it is not then the call manager would not attempt to send the call to an unregistered endpoint. If it is H323 I would say yes you should see the call if you have the correct dial peer configuration.

New Member

Re: debug isdn q931 on gateway question

Yeah, MGCP. Says "Registered" when I do a show ccm-manager. In CUCM, it says registered with the IP address of CUCM.

Re: debug isdn q931 on gateway question

Did you verify your route patterns and route lists in ccm to make sure that when you make an outbound call you are indeed using that gateway?

New Member

Re: debug isdn q931 on gateway question

Yeah, its the only one I have setup now. I havent entered the other gateways yet.

New Member

Re: debug isdn q931 on gateway question

I can dial 911 and it starts to process the call, but I never see it on the gateway. I just didnt know if it was because of the PRI not being in place, and me just using a loopback.

Re: debug isdn q931 on gateway question

I have never tried your exact scenario with a loopback plug on the PRI. I would think though you would see the call at least hit the GW. What is your out put of a "debug voip ccapi inout"

New Member

Re: debug isdn q931 on gateway question

No output at all. Just tried it. Just like with debug isdn q931. Just nothing.

Re: debug isdn q931 on gateway question

That tells me that the call is never getting to the gateway then if you dont see anything on ccapi.

New Member

Re: debug isdn q931 on gateway question

Hmmmm. Ok, let me review, see what you think. I have a route pattern, 911, that says go to route list RL. RL points to route group RG, no special config in it. Route group has in "selected devices" S0/SU0/DS1-0... I click on that interface at the bottom and it takes me to S0/SU0/DS1-0 page, where it says registered with CUCM IP address. What else should I check?

Re: debug isdn q931 on gateway question

have you verified partition and CSS? Run the DNA and see if the call goes where you think it does.

The config does sound right though.

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New Member

Re: debug isdn q931 on gateway question

ok, some of my ignorance here, but what is the DNA?

Re: debug isdn q931 on gateway question

Its the Dialed number analyzer. I don't know what version of CCM you have, but it would be in the plug ins as an application to download. This takes what is in your database and uses those configurations to simulate a call and where it would end up.

Here is a little something on it but you may have to find something more specific for your version.

http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/dna/4_0_1/dnai.html

New Member

Re: debug isdn q931 on gateway question

I have 6.1.1 . Just went and looked for it on the plugins page. Didnt see it. Going to look at the link you sent.

Re: debug isdn q931 on gateway question

Then it is in Cisco Unified Serviceability and under tools.

New Member

Re: debug isdn q931 on gateway question

ok, thanks. going to eat some lunch. will check this when i get back.

New Member

Re: debug isdn q931 on gateway question

Hi,

I have run into this situation many times before, and you will never see any call information on the mgcp gateway until you have complete l2 and l3 isdn backhaul to the UCM. From your IOS gateway, it will show as registered, but from the UCM, it will show as unregistered. Once you have the PRI connected, the status on the UCM will change to registered and you will be able to see isdn l2 (q921) and l3 (q931) call information.

Re: debug isdn q931 on gateway question

But as he says above it is registered with UCM

New Member

Re: debug isdn q931 on gateway question

ok, back now. Yeah, I have a loopback on it and it says registered. GOing to look for DNA now.

New Member

Re: debug isdn q931 on gateway question

Sorry guys, still looking for this. Any idea in particular in Serviceability where it is?

New Member

Re: debug isdn q931 on gateway question

Ok, found that it was not activated in service activation. I activated it, now looking for it to download.

New Member

Re: debug isdn q931 on gateway question

ok, found it and going through it now. I think it basically is saying what it uses for that route pattern (911) and uses the RG, RL, etc that I stated earlier. Still looking through it.

New Member

Re: debug isdn q931 on gateway question

ok, here is what I think it says: under "call flow" (I think this is where I should be looking), it gives me the route pattern Im dialing (911), says that it hits the right route list, says that it hits the righ route group, device "end device name" is correct S0/SU0/DS1-0@xxxx.com, device says "registered". Alternate matches = none. Any ideas?

New Member

Re: debug isdn q931 on gateway question

Maybe it just doesnt if the PRI isnt connected, and a loopback doesnt work for this????? Im not sure, as I have never really tried this in a lab before. I just thought Id like to test it out and so I tried it. Not KNOWING if it will work or not.

New Member

Re: debug isdn q931 on gateway question

Im going to go ahead and rate this, even though Im not sure why it doesnt show up. I appreciate the help Matt. I learned about the DNA, so this has been very helpful to me. I think its configured correctly, Im just not sure why it doesnt show at the gateway. Both see each other as registered, call flow seems to go out that PRI line (looped back) according to DNA. I wonder if the call must go "through" the gateway instead of "to" the gateway before it shows??? Not sure, but Im guessing that may be it.

New Member

Re: debug isdn q931 on gateway question

Hi

I have seen this problem before where no voip debug comes through, is the Route List registered? try resetting it.

Bronze

Re: debug isdn q931 on gateway question

Did you do a show isdn status? It must say "Multiple FRAME Established". I highly doubt this is going to work without a PRI turned up. Simply looping the interface will not be enough.

Otherwise, try "debug isdn q921" and see if you are getting SABME messages in the debugs. If you see it sending in one direction, then simply looping the interface will not work.

Silver

Re: debug isdn q931 on gateway question

I also have an issue same as this in that the DNA is routing the call but no L3 on the debugs

Silver

Re: debug isdn q931 on gateway question

I also have an issue same as this in that the DNA is routing the call but no L3 on the debugs

New Member

Re: debug isdn q931 on gateway question

Ill look at this also and see. Thanks for the input.

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