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Universal Portable CTEL Interface (UPCI [UHI]) control unit, location/task - GF82.70-P-5100S

MODELS 215, 220 as of 1.6.04 with CODE (388) "Portable CTEL" UPCI telephone system 

Shown on model 220 

Fig 1: Identifying Universal Portable CTEL Interface Control Unit Location - Shown On Model 220
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  Universal Portable CTEL Interface (UPCI) control unit, location The Universal Portable CTEL Interface (UPCI) control unit (N123/1) is located below the rear bench seat.  
  Universal Portable CTEL Interface (UPCI) control unit, task The Universal Portable CTEL Interface (UPCI) control unit (N123/1) is used to convert electric signals into optical signals and vice versa.
Furthermore, it is used as a transmitter and receiver for Bluetooth-capable devices (e.g. rear telephone handset (A34/8)). This function is not available in the USA