osmocon idling with C155 when using bus pirate

[Ian Kinsey]

A Motorola C155 is hooked up to my computer via a bus pirate as per the
official instructions, everything is properly wired and the phone seems to
work. However, Osmocon neither indicates the presence of any data being
sent or received when attempting to communicate with the phone; it just
idles. Is there any extra logic in the cable? Any help would be appreciated.
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