External call forwarding and billing - PBX Info :: Your Free PBX, PABX and Telephone Information Resource

tim_abney · 04-22-2004, 01:59 PM

I have a customer who allows external call forwarding but has a problem with the LD billing they get from the carrier. Evidently the carrier bills from D-channel information not CDR from the PBX. When a call tandems through the switch because of the extrenal forwading they don't pick up the forwarding DN inforamation and so they bill against the BTN on the span.

Anyone deal with this situation before? I doubt they will be able to come up with a solution unless they somehow use the CDR records from the PBX. Any suggestions????

Thanks

***hhallett*** · 04-22-2004, 08:18 PM

What you basically have in the situation you described are trunk-trunk calls. A call comes into your PBX via an inbound trunk, the PBX sees that calls to that DN are to be immediately forwarded off of the system and it does as it's told. The received call never gets associated with the specific DN because your PBX has been told to get rid of the call as soon as it gets it.

I've seen this before and the only way I've ever heard of getting around it is not very cost effective or much fun. That is to have the PBX collect CDR for inbound calls as well and then have someone at your company match the telco phone bill with the CDR.

As a side note, this also ties up 2 of your trunks for the duration of the call.

**Fletch** · 04-22-2004, 11:45 PM

Tim-

I would be interested in seeing the following for the switch:

CLID Tables
NET_DATA Block
Route Data Block
Sample TN of the phone
If possible a snapshot of the DCH messaging of the outbound leg. It would be best to have this in both MON 2 and MON 0 formats. You would have to do this in the off hours so you didn't get too much clutter on the DCH.

If you have Succession Release 3.0, the DCH UIPE Engine has been enhanced so you only see messaging from a selected TN if that is what you want. That's one of my favorite features in 3.0, but I'm a PRI geek at heart.

Also, what release are you running? You can email me the information if you want. No promise of a fast turn around, but I may have some time in the morning to look at it if you get it to me early.

***hhallett*** · 04-23-2004, 02:47 AM

Fletch;

You ask for some interesting information. How does any of this affect the situation that Tim has described?

I mean, aren't the CLID tables, phone NCOS, RDB, etc pretty much ignored when XFA is invoked?

I'd like to know so please educate me.

**Fletch** · 04-23-2004, 07:48 AM

Not really. If you are generating an outbound call, either by calling or an XFA in this case, the system still invokes the subroutines needed to generate the CLID.

If the carrier does not see a proper CLID, then they go for the BTN. I have a hunch of where the problem may be on this one. If I am right, I will certainly let you know. The system assembles the CLID differently on an XFA than it does on a direct dial call via NARS/BARS.

tim_abney · 04-23-2004, 02:48 PM

Hey, Fletch,
It might take me a bit to get all the information you asked for but, I will try to get it to you.
Thanks for your help,
Tim

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