Not CO, but I did work on Nortel Option 11/61 PBXes.  There is a huge drive to move everything to IP telephony (local and infrastructure) but one thing the COs did have was incredible reliability that the IP networks just cant match, at least the COs in my area.  There is evidence of the Telco's rigorous maintenance routine in the form of maintenance logs at my larger facilities that have the last entries in the early 2000s.

On 2/15/2025 8:59 PM, Brenda Gentry via GreenKeys wrote:

Are there any greenkeyers who also take interest in telephone central office switching?

  B. Gentry   KA2IVY


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