Callmanager call blocking

[Paul Austin]

Hi Folks, So I've implemented the solution to block unwanted calls based on their CLID as per this guide :-

http://www.netcraftsmen.net/blogs/entry/cisco-cucm-blocking-calls-by-calling-party-number-id.html   and it works a treat BUT it also stops calls from progressing if calls are received when there is NO CLID in the call.

Question, is there another way of doing this or is there something else I need to do?

Thanks

Paul

[William Bell · Accepted solution]

Hey Paul,

I replied to your comment on the NetCraftsmen site. When there is no CLID presented to UCM (i.e. blank) then you will need a translation pattern that is also blank to match the CLID. Guessing at your config based on your blog comment, I think that if you copied the "!" pattern and deleted the exclamation point (thus having a blank pattern) then you should be good to go. You should disable urgent priority on the blank pattern.

If the call is coming in on a SIP trunk then there may be other considerations. Check the above first and then we can go from there.

HTH

-Bill (@ucguerrilla, http://ucguerrilla.com)

[Paul Austin]

Hi Bill, Thanks for that but I had already tried that. 

BTW the calls are coming in via a SIP trunk.

Many thanks for replying though.

[Kirill Glushenkov]

Paul,

how did you do the restriction? Using CUCM?

Please, check, if you have Reject Anonymous Calls on DN.

Regards,

Kirill

[Paul Austin]

Hi Kirill, I just followed the excellent guide and implemented on CUCM - http://www.netcraftsmen.net/blogs/entry/cisco-cucm-blocking-calls-by-calling-party-number-id.html it does work and whilst not the easiest way I'd like to see the administration of this done, it does makes sense.

TBH, I'd like Cisco to implement a simole list whereas you can add to a list the numbers that you want rejected.

[Kirill Glushenkov]

Paul,

Did you check DN config?

[Paul Austin]

Hi Kirill, yes I did. I confirmed that the setup was working by configuring some blocked number translations and then called a different number which completed. I then withheld the CLID from my mobile/cell phone and dialled the same number which failed. Looking at the SIP CUBE trace of a call that comes in with the CLID withheld, it sows as anonymous which is correct.

[Kirill Glushenkov]

Ok, thnax.

Then we nned to collect SDI/SDL traces to see what's going on.

First of all , in Service Parameters, check Digit Analysis, it should be  TranslationAndAlternatePatternAnalysis .

Then in Serviceability u need to configure Detailed level of Call Manager traces.

Make a call and download traces.

Regards,

Kirill

[William Bell]

Paul,

As noted in my comment, calls traversing a SIP trunk into your organization requires special consideration. With SIP, the From: header will most likely have the text "anonymous" or "unavailable". This is probably putting a wrench in your approach.

You may be able to use a LUA script on the UCM (sip trunk) or header manipulation on the UBE to strip out the "anonymous" and replace it with (blank). I don't have a recipe for your right at the moment but I think you will find your solution on one of those two areas. I'll check back if I have time to mock up and test.

-Bill (@ucguerrilla)