Given that we don't know the origin of the ERROR INDication (whether it's coming from the MS, or the BTS itself), both GSM0808_CAUSE_{MS,BSS}_NOT_EQUIPPED values are kind of valid. My proposal is to expect either of the two possible values:

  f_exp_sapi_n_reject(3, (GSM0808_CAUSE_BSS_NOT_EQUIPPED,
                          GSM0808_CAUSE_MS_NOT_EQUIPPED), '10'B);

After all, what we want to verify here is the 'Control Channel type' bits.

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