We have the same question.

According to RingCentral's FAQ. yes.

RingCentral's requirements seem to be more stringent than their competitors in this regard. RingCentral is the only vendor I've seen that requires TCR campaign registration for conversational SMS.

Just got off the phone with support and they said we need to fill out a campaign even though we do not use it for marketing. They also said that I was the only person with this concern. LOL

So far they have charged me $4.30 to register and $17.27 to fill out a campaign that I will never do. Any luck on getting a straight answer for this? In the mean time will be looking for another carrier.