Now this was pretty much an every-home phone for a while, when touch-tone service hit the scene. Between Western Bell and AT&T, this saturated the market, and held on to the ‘phone company owns your phone’ format. I love this phone. The model in this entry is the RD2500DMG, with a Serial of CS2554MPG.
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From Wikipedia:
Model 2500[edit]
Western Electric Model 2500 telephone, manufactured in March 1980. The front is squared compared to the model 500, and it featured modular cords.
By the late 1960s interactive response systems in some industries required additional signaling beyond the ten digits. In 1968, the # key and the * key were added to the push-button dial pad, and the 2500-type telephone entered production. The additional keys were located on either side of the ‘0’ button to fill the matrix of 4-by-3 keys. These keys were initially unused by most customers, but would later be used for vertical service codes, and voice mail menu navigation. In 1974, when modular connectors were introduced, the 2500 telephone was fitted with modular connectors for the handset cord as well as the line cord, resulting in type designations suffixed with M, e.g. 2500DM. The 2500 is still commonly encountered today and it is still produced by several companies.
In addition to the basic single-line model, the Western Electric 2500-series included many related variations and special purpose models with additional features. This included sets with a headset jack, 2-line sets, keysets (2560), call directors, panel phones (2750), industrial phones (2520), automatic dialers (2660).[8]