A proprietary voice terminal used with Centrex service, P-phones are proprietary to the central office (CO) switch manufacturer. P-phones are required for maximum ease of feature access, although most systems support generic sets, as well.
"P-phone." YourDictionary, n.d. Web. 09 November 2018. <https://www.yourdictionary.com/p-phone>.
P-phone. (n.d.). Retrieved November 09th, 2018, from https://www.yourdictionary.com/p-phone
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