Call going straight to a station, but can't find where it is routed !

[nverhoest]

Hi,

I have here a very strange behavior...

A client has just discovered he has calls coming on ddi's he didn't knew before.

Calls placed on those ddi's go directly to a station, but I can't find any place where it is configured. It is of course not configured in inc-call-handling-trmt as we didn't knew thoses DDI. There isn't either any matching pattern...

There are no entries in UDP,...

When doing a trace on the tac I get this :

15:02:22     Calling party trunk-group 1 member 29  cid 0x1a
15:02:22     Calling Number & Name ******** NO-CPName
15:02:22     active trunk-group 1 member 29  cid 0x1a
15:02:22     dial 223
15:02:22     ring station    223 cid 0x1a
15:02:22     G711A ss:off ps:20 rn:1/1 10.0.2.56:2996 10.0.0.193:2802
15:02:22     xoip: fax:T38 modem:off tty:US 10.0.0.193:2802 uid:0x15
15:02:23     idle trunk-group 1 member 29  cid 0x1a

Nothing really interesting.

I also added an entry for that ddi into inc-call-handling-trmt to test and make sure it is no digit conversion on provider side.

I already tried using "list usage extension" on that extension and on extension of pickupgroups/... it is in.

I have really no idea on where to search, and understand how that ddi is routed to that station...

Any help or idea would be appreciated ! ;-)

Thank you !

Nicolas
ACS Business partner

 

[dufus2506]

It could be as simple as the alternate numbers are call forwarded at the PSTN level to that station.

Check with the provider. They should be able to tell.

Carpe dialem! (Seize the line!)

 

[nverhoest]

I already considered that case, so I entered that ddi in inc-call-handling-trmt and routed it to a station to make sure the called ddi is the same as the incoming one, and it worked...

Nicolas
ACS Business partner

 

[dufus2506]

Right...
So, I'd check two more things:

1. Is that station a night station for incoming calls, and the system in night mode?

2. Check to see if that station is the DID/Tie/ISDN/SIP Intercept Treatment destination in the system-parameters features first page. (That entry isn't likely to show up in a list usage extension search.) Calls to any numbers with no assignment in the PBX go to that extension or treatment.

Carpe dialem! (Seize the line!)

 

[nverhoest]

Hello,

Sorry for the delay, checked all these things, still nothing...

That's quite strange !

Nicolas
ACS Business partner

 

[DontDeleteMeAgain]

What is station 223? Do list ext 223

 

[nverhoest]

Just a simple station...

223            station-user                      1    1    999

Nicolas
ACS Business partner

 

[dufus2506]

Hmmm...

Ok... lets take this a bit more logically...

Your extensions are 3 digits long. Is 223 the last 3 digits of the incoming DNIS, or is it the first three of a 4 digit incoming DNIS?

If the phone number range was 617-555-2220 through 617-555-2239, and your phone company was sending 4 digit DNIS, then you'd get all 10 numbers in each 10-number range going to station 222 and 223.

Could that be happening? Could you ask the PSTN vendor how many DNIS digits they're sending? COuld they be sending 3 digits for one range, and 4 digits for another?

Carpe dialem! (Seize the line!)

 

[nverhoest]

I think you pointed the right problem !

Installation is in Belgium, so 8 digits are sent.

I didn't specially paid attention to incoming ddi... but it is 02/23x.xx.xx, and PSTN sends 223xxxxx.

So the 3 leading digits are my internal extension ! But why does it take in account only the 3 first digits ?

Nicolas
ACS Business partner

 

[dufus2506]

Once the PBX has a match for the incoming phone number, it routes to that destination, and ignores all other digits.

Just as if you had dialed the extension from a phone, but continued to dial more digits even after the destination had begun to ring.

Usually, the DDI is directed to the an extension that comprise the last digits of the DDI.

It would sound like you have two solutions here. One would be to contact the PSTN provider, and have them restrict the DNIS to the last three digits of the incoming DDI. Of course, you would make certain that the extensions in the PBX match the digits being sent.

Alternatively, you could increase the digit length of the extensions on the PBX, but that may present problems as users do not usually like to see their extensions change.

Carpe dialem! (Seize the line!)

 

[nverhoest]

I will just try going on convincing customer to try to match it's internal extension with DID !

And add inc-call-handling for that range...

Thanks again !


Nicolas
ACS Business partner