[cisco-voip] Asking the experts (Carrier to PBX Issues)

[J. Oquendo]

Comments inline:

Kevin Thorngren wrote:
>
> Does this problem happen with every call?
>
Nope.
> Does it only happen when the call is originating from certain carriers?
Happens from a few spread carriers.
> How does the caller get in touch with your customer to ask if the 
> phones are down?
>
They're calling to our client's cellphones to let them know "Hey you're 
main number isn't working"
> What happens if you place an outbound call from your customer's site 
> to one of your customer's phone numbers, i.e., hair pinning the call 
> through your customer's carrier?
>
Call goes through just fine. In fact the majority of those dropped go 
out fine. They just don't come back in.
> The carrier states they aren't seeing the calls in their switches.  If 
> I understand the problem correctly this is saying that the customer's 
> carrier is not receiving the call from the originating side.  Which 
> means that the call won't be extended to your customer.  Am I 
> understanding this correctly?
>
Yes this is correct. ASCII Flowchart:

What is should be:
CallerToClient --> Their Carrier --> MyClient'sCarrier --> OurPBX

What is happening:
CallerToClient --> TheirCarrier --> MyClient'sCarrier

Between the caller's carriar and my client's, my client's sees nothing 
hitting their switches. No trace of any calls coming in.


> What does the carrier mean by "this never happened to us when we did 
> the phone lines over PSTN"?  And how does this apply if they aren't 
> receiving the call from the originating side?
>
I'm unsure what they meant. From what I understand, my client's carrier 
is pointing to another NSP (Qwest) having a corrupted routing database 
or so. This is even more boggling since I normally see something pop up 
on NANOG, I've sent a quickie out to NANOG and haven't heard a peep 
about something gone bad at Qwest.

====================================================
J. Oquendo
http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x1383A743
sil . infiltrated @ net http://www.infiltrated.net 

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