It's my understanding that the blue label is required to support the bluetooth adapter. The analog/digital doesn't apply because the call is being made through your cellphone. The original phone adapter did have an antenna connection on it, but it was a micro-coax connector. The part number and name of the adapter I purchased is:
"V60 Adapter with Bluetooth" p/n B67875856

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Richard Wooldridge
'01 ML320
'82 300D 4.3L V6/T700R4 conversion
'82 380SL, '86 560SL engine/trans. installed
'79 450SL, digital servo update
'75 280C