I'm not sure what the question was that started this thread about disconnecting TDM trunks, but I specialize in writing ASRs for SS7 trunk groups (local, wireless, and FGD). Turning down the SS7 network doesn't start with disconnecting the trunk groups. The NPA-NXX codes all have to be returned or re-routed to a different switch in BIRRDS before the RBOC/ILEC will even assign a project ID. If the traffic is being routed to a different trunk group that was set up by a third party, the translations page on the ASR also needs to be completed so they change the NXX translations before they remove the trunks. 

There's not many of us dinosaurs left out there who know how the SS7 network is set up, muchless how to track down the information from the bills / system and write the orders for the trunks, transport, SS7 routes, and links. If you need help, you can reach out to me privately.

On 2026-01-06 02:40 PM, Jeff Shultz via VoiceOps wrote:

You'll definitely want to be working with whoever manages SS7 for you, as there will likely be SS7 route sets involved that you will need to remove from your switch, particularly if the reason you are disconnecting the circuit is because the switch you were talking to is going away. 

 

On Tue, Jan 6, 2026 at 11:39 AM Kidd Filby via VoiceOps <voiceops@voiceops.org> wrote:

Having done this numerous times across the country, this work order (Disco of Trunks &/or Facilities) is usually considered a PROJECT by the ILEC's, so be expecting an additional charge for it.  Be diligent on their billing and estimates for the work.  Make sure it makes sense.  It is also a very good idea to validate each T1 to ensure you are both working on the same ones at the same time, before the cut-over or disco.  I know SS7 usually does a great job keeping things straight but... I have found record discrepancies.... on both sides.  Best to be safe than sorry.

 

Good luck to all and congrats on being able to do it.

On Tue, Jan 6, 2026 at 11:55 AM Mike Hammett via VoiceOps <voiceops@voiceops.org> wrote:

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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http://www.linkedin.com/in/kiddfilby 

 

 

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