Unfounded speculation, but I think this is a short-term hack and will ultimately go the way of the dodo. Yes, services like this will go the way of the dodo. You can't impersonate the original caller per se. There will be some other way to pass the identity of the caller, or other enriched call data that would be relevant to a database lookup. It won't be by presenting CID of a number you don't own. -- Alex
On Nov 21, 2025, at 5:02 PM, Carlos Alvarez via VoiceOps <voiceops@voiceops.org> wrote:
I’ve just deployed something similar to this via Telin. I’m sure others can do it too. They have an automated system that verifies your ownership/permission to use a phone number, and from then on, you can use it and get either B or A attestation. The most common interpretation of the current regs is that this is the only way you can send off-net CLID in the future. If you want to have a live conversation about this I’m open to a call. It’s something I’ve been doing since the 90s and constantly fighting the changing landscape on CLID.
If you’d like to talk to someone at Telin I can make an intro. Great people, solid service.
On Nov 19, 2025 at 9:07:54 AM, Aaron C. de Bruyn via VoiceOps <voiceops@voiceops.org> wrote:
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,
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-- Alex Balashov Principal Consultant Evariste Systems LLC Web: https://evaristesys.com, https://www.csrpswitch.com Tel: +1-706-510-6800