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Issues with routing empty Called Number

Answered Question
Aug 13th, 2014
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Hello All,

I am having difficulties when trying to set up a voice gateway router on one of our sites in Luxembourg. We have a BRI circuit connected to Cisco 2911 router, telco assigned a number +352-YYYYYY-XX where YYYYYY is the main office number and XX are two digit DID extensions.

I am trying to route the calls with XX extensions to 8100XX and the calls to the main number +352-YYYYYY to 810000

Here is the problem, the telco only seems to be passing the extension number as Called Number as per tests below:

  1. When I called 00352 YYYYYY 02, in show call active voice I can see:
OriginalCalledNumber=02
GwReceivedCalledNumber=02

In debugs we have:
        Called Party Number i = 0x81, '02'
  1. When I called 00352 YYYYYY 35 :
OriginalCalledNumber=35
GwReceivedCalledNumber=35

In debugs:
        Called Party Number i = 0x81, '35'
  1. And finally, when I called 00352 YYYYYY
OriginalCalledNumber=
OriginalRedirectCalledNumber=

No Called Party Number in q931 debugs

 

And here is the current related pots config:

interface BRI0/0/0
 no ip address
 isdn switch-type basic-net3
 isdn point-to-point-setup
 isdn incoming-voice voice
 isdn supp-service name calling
 isdn sending-complete
 isdn static-tei 0

voice-port 0/0/0
 compand-type a-law

voice translation-rule 401
 rule 1 /^\(.*\)/ /8100\1/

voice translation-profile 4digits
 translate called 401

dial-peer voice 1 pots
 translation-profile incoming 4digits
 incoming called-number .
 direct-inward-dial
!
dial-peer voice 2 pots
 preference 1
 destination-pattern 9T
 port 0/0/0
!

As expected the YYYYYY-XX calles are being routed correctly to the users but I can't figure out how to set up calls coming to +352-YYYYYY. I can see them hitting the router but getting following message:

Aug 13 09:01:15.125: ISDN BR0/0/0 Q931: TX -> DISCONNECT pd = 8  callref = 0x81
        Cause i = 0x809C - Invalid number format (incomplete number)

Any ideas how I can configure them calls to be going to 810000?

I appologise if this is a trivial problem but I am new to VoIP and would really appreciate any help.

Best Regards,

Mike

Correct Answer by Jameson Gagnepain about 3 years 1 week ago

Mike,

You can use ^$ in a translation rule to match the null digit string. I suggest perhaps changing translation-rule 401 to the following:

voice translation-rule 401
 rule 1 /^\(.*\)/ /8100\1/
 rule 2 /^$/ /810000/

I would warn though that you're probably going to match dial-peer 2, not dial-peer 1. The dot will not match null digits, and dial-peer 2 would likely be picked because it's the most specific choice (with the port 0/0/0 rule). You may need to change dial-peer 1 to the following:

dial-peer voice 1 pots
 translation-profile incoming 4digits
 incoming called-number T
 direct-inward-dial
 port 0/0/0

Alternatively, you could potentially apply the translation-profile to the voice-port instead... though you would have to make the translation rule more specific to the 2-digit extensions:

 rule 1 /^\(..\)$/ /8100\1/

-Jameson

 

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Correct Answer
Jameson Gagnepain Wed, 08/13/2014 - 06:18
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Mike,

You can use ^$ in a translation rule to match the null digit string. I suggest perhaps changing translation-rule 401 to the following:

voice translation-rule 401
 rule 1 /^\(.*\)/ /8100\1/
 rule 2 /^$/ /810000/

I would warn though that you're probably going to match dial-peer 2, not dial-peer 1. The dot will not match null digits, and dial-peer 2 would likely be picked because it's the most specific choice (with the port 0/0/0 rule). You may need to change dial-peer 1 to the following:

dial-peer voice 1 pots
 translation-profile incoming 4digits
 incoming called-number T
 direct-inward-dial
 port 0/0/0

Alternatively, you could potentially apply the translation-profile to the voice-port instead... though you would have to make the translation rule more specific to the 2-digit extensions:

 rule 1 /^\(..\)$/ /8100\1/

-Jameson

 

michalstaporek Wed, 08/13/2014 - 07:10
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It's working, thank you very much!

I have tried '/^$/ /810000/' before, but I had '.' instead of 'T' on the dial-peer and it was failing.

Thanks a lot for your input.

Best Regards,

Mike

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