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Any one from MCI Metro Access on this list?
by Shawn L Feb. 3, 2026

Feb. 3, 2026

Is there anyone from MCI Metro Access on this list? Google seems to think they're now owned by Verizon, but none of my Verizon contacts are able to help. All of their circuits to the tandem in lata 342 seem to be down, and calls to any of the numbers they've ported go to a fairly hastily recorded "the carrier selected is unable to complete your call at this time" recording for the last 5 days. Unfortunately, one of their customers is Walgreens, so none of the local hospitals can call in a prescription over a landline. The local AT&T tandem doesn't seem to have had any luck getting ahold of them. Thanks

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Services that rely on Caller ID spoofing?
by Aaron C. de Bruyn Jan. 13, 2026

Jan. 13, 2026

I'm not entirely up on the whole FCC Caller ID Spoofing crackdown that's going on, but I just ran into a 3rd party service for medical offices that expects us to spoof Caller ID. The service works like this: * I grab my cell phone (123-456-7890) and call my doctor/dentist/medical office * It's after hours and they are busy with other calls * Their phone system turns around and forwards my call to a 3rd-party number (say 111-222-3333) emitting my Caller ID info ("Aaron" <1234567890>) * They see a call come in on 111-222-3333 and know it's for "Dr. Bob's Office", so their system accesses his patient database and looks for my patient record with the phone number 123-456-7890 and someone answers the call saying "Thanks for calling Dr. Bob's office". My understanding is the ability to spoof Caller ID info across the PSTN is going away. I tested, and I certainly can't do it with a Twilio SIP trunk. The main reason I'm curious is I have a customer that has their own phone system that I help them manage (FreePBX linked to Twilio). They just purchased an office that uses a 3rd-party phone provider (Weave) along with this 3rd-party answering service, and they are somewhat upset that I can't make it work with their existing phone system. The third-party answering service doesn't have any way of interconnecting other than spoofing Caller ID over the PSTN to a random number they assigned to the medical office. Are services like this going the way of the dodo? Are they having to set up private SIP trunks between clients to get this functionality? Do some VoIP providers allow you to spoof Caller ID for this purpose under some sort of agreement? Thanks, -A

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FYI: TDM Disconnections
by Mike Hammett Jan. 9, 2026

Jan. 9, 2026

FYI: If you're disconnecting TDM circuits from the tandem or other ILEC voice switches, you first need to put in disconnect orders for the trunk groups before you can disconnect the underlying DS1s or DS3s. Also, those trunk group identifications aren't on your bill, so you've got to work with the ILEC to get the information you need to be able to cancel circuits. ----- Mike Hammett Intelligent Computing Solutions Midwest Internet Exchange DNA Communications

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Level 3 Porting Speed
by Mike Hammett Nov. 20, 2025

Nov. 20, 2025

How quickly does the Level 3 ecosystem work ports? One of our customers is leaving (we're dropping their PRI and they didn't want to switch to our fiber). The gaining provider (who uses Level 3) told the customer it would be December 9th. We haven't received an LSR yet. Is Level 3 that slow, or is my competitor just that disorganized? ----- Mike Hammett Intelligent Computing Solutions http://www.ics-il.com Midwest Internet Exchange http://www.midwest-ix.com

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Major Network Can't Get Porting Together
by Mike Hammett Nov. 20, 2025

Nov. 20, 2025

We have a major network that outsources its porting activities to someone else. I don't know that we've had a seamless port with that combination. Have any of you had similar struggles? Actually, wait, we've had another major network use the same outsourcing porting organization. Maybe it's the outsourcing porting organization that sucks. We get LSRs for numbers that aren't ours. We got LSRs for customers leaving, but they'll cancel and resend the request multiple times. I think we've had over a dozen attempts before they finally stopped canceling and let it go through. We get LSRs for numbers belonging to customers that have no interest in leaving. Almost exclusively, this same porting organization. ----- Mike Hammett Intelligent Computing Solutions http://www.ics-il.com Midwest Internet Exchange http://www.midwest-ix.com

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Migration from TDM and Tandems to PSTN-Connect
by Mike Hammett Nov. 17, 2025

Nov. 17, 2025

Tomorrow is the LERG effective date for our migration from TDM to using Sinch's PSTN-Connect. We have verified calls flow via testing with our consultant (Award) and Sinch. Given that this is pretty monumental and there doesn't appear to be as easy a "backing out" as there is with the Internet, what are the things I should triple-check? What are the things I should be watching? What are the tests I should be doing to ensure everything is 100%? Also with a LERG effective date, is that at midnight local time, or some other time when calls start flowing differently? When do I switch my Metaswitch to passing calls via Sinch instead of the tandem? I have asked Sinch and my consultants similar questions, just as a kind of sanity check. ----- Mike Hammett Intelligent Computing Solutions http://www.ics-il.com Midwest Internet Exchange http://www.midwest-ix.com

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Port Conflict
by Mike Hammett Nov. 13, 2025

Nov. 13, 2025

When you receive an LSR for a number that a customer has not authorized to port out, do you go into SOA and place the SV into conflict? ----- Mike Hammett Intelligent Computing Solutions http://www.ics-il.com Midwest Internet Exchange http://www.midwest-ix.com

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Spectrum Voice Contact
by Shawn L Nov. 10, 2025

Nov. 10, 2025

Wondering if there's someone on from Spectrum on who can point me in the right direction for a DTMF issue. Normal Spectrum trouble tickets don't seem to be working. We have a customer with several analog lines that's not getting DTMF tones, so calls are hitting the IVR and not able to go anywhere. It doesn't happen with all carriers -- AT&T and Spectrum work. Calls that traverse the Verizon network do not. We have a temp fix in place (CSR answering calls that fail the IVR) but it's been going on for a while now and we need to find a more permanent solution. Thanks Shawn

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How do the IXCs exchagne calls and peer between eachother?
by edamato＠ricetelecom.net Nov. 10, 2025

Nov. 10, 2025

Hello all, I've been trying to better understand the inner workings of the US phone network for some time now, and I think that I have come pretty far in that goal, but there is still one topic which I have been unable to figure out: how do the major IXCs exchange calls with each other for destination numbers using off-net FGD tandems. I understand that, for example, MCI can pick up a call directly from a customer, or from a PICed line at a ILEC FGD tandem, and then cart that call to the FGD tandem for the target LATA (or to a private interconnect with the destination carrier), moving through several switches along the way. What I'm trying to understand is how calls reach alternate FGD tandems (e.x. widevoice, teliax, intelliquent) when the call is being carried by a different IXC (e.x. AT&T). Right now, I could order a CLLI code, and assuming that I could get SS7 connections, put up a switch that would reachable by any other switch, but I would have no actual circuits on which I could accept calls. Must these alternate FGD tandem providers acquire trunking from every outbound provider for their service to be usable? Is there some kind of inter IXC transit service? I would appreciate any insight that you could provide. Thank you, Enzo Damato

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Verizon Wireless in wi-fi calling mode failures to lumen.com Mclean, VA switch
by Chuck Brodersen Nov. 8, 2025

Nov. 8, 2025

We cleared on November 5th a 30 day issue of east coast Verizon wireless callers in wi-fi calling mode having a call failure or one-way audio to a lumen.com Mclean, Virgina switch. The fix was Verizon changing routing to Lumen. Did anyone else experience this?

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