[VoiceOps] Canadian TF termination

Mark Timm Mark.Timm at netins.com
Fri Jan 23 14:56:04 EST 2015

I’ll politely interject the ANI of the originating number does matter as the SMS routes the call based on the ANI and originating LATA.  Occasionally a toll free number might be CIC’d to a carrier that the originating switch does not interconnect to.  If you don’t have trunks to that carrier obviously the call will fail but the toll free owner (RESPORG) can change that CIC.   If you have the ability to launch an 800 query it will tell you the carrier based on the ANI and LATA.

The below webpage may be helpful and will provide a trouble reporting number for any given toll free.


From: VoiceOps [mailto:voiceops-bounces at voiceops.org] On Behalf Of Calvin E.
Sent: Friday, January 23, 2015 1:33 PM
To: voiceops at voiceops.org
Subject: Re: [VoiceOps] Canadian TF termination

I thought it worth sharing some feedback from a coworker who has been doing this a few decades longer than myself:

"First, there’s no such thing as a “Canadian” TFN.  There are NANP TFNs that can, in theory, be dialed from anywhere in the NANP.  Due to massive cost differences, NANP telcos allow TFN owners to restrict dialing to certain areas – 48 states, AK, HI, Canada, USVI/PR, Caribbean, or any combination thereof.

"Second, it doesn’t matter what the ANI of the calling number is.  What matters is where the call is dropped into the PSTN.  Thus, if a TFN that is restricted to Canadian callers only is dialed, and we drop that call off to one of our US TF Termination vendors, the call will be blocked, as the first PSTN vendor in the line does an SMS dip, sees this TFN is restricted to Canada dialers only, sees the call is entering the PSTN in the US, and rejects it whether the calling number has a Canada NPA or a US NPA."

I hope this helps you find a solution.

--Calvin, a voice services engineer

On Fri, Jan 23, 2015 at 8:38 AM, Ryan Delgrosso <ryandelgrosso at gmail.com<mailto:ryandelgrosso at gmail.com>> wrote:
We have trunks with a few canadian providers and route calls from canadian source numbers to TF calls exclusively over trunks to canadian providers. Usually that solves the issue.

On 1/22/2015 10:39 AM, Ujjval Karihaloo wrote:
Hi All:
  We are being told by Level3 that if a Canadian DID calls a Canacdian TF number, they cannot guarantee call complete and its best effort. Anyone else run into something similar?


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