Popularity of post-Carterfone PBX equipment? [telecom]

The 1968 Carterfone decision allowed subscribers to use non-Bell equipment, including PBX systems.

The Bell Labs history reports, "after the FCC Carterfone decision of 1968, a number of non-Bell interconnect companies were formed to market PBX systems and other terminal equipment directly to customers. This marketing effort made some inroads into Bell System sales by 1971."

Would anyone know populararity of Carterfone-Decision PRE-Divestiture non-Bell PBX systems or other customer equipment?

For instance, in 1970 ITT ran a full page ad in LIFE magazine for their EPABX (Electronic Private Automatic Branch Exchange), claiming it was the only solid state unit available. (I'm not sure if that's true, as Bell had its 800 series electronic PBX's.)

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As an aside, Bell did allow for decades certain customer owned equipment to be connected to its network? This included PA systems, music players, and dictation machines. Pipelines, railroads, and the military could interconnect various customer-owned and maintained equipment.

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HAncock4
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