You advised leaving sales talk with women to a female setter if there is one. My online B2B marketing agency has no women on the team. Sometimes a woman is the only decision maker. May I do the sales and client calls, audio only, strictly business? If not, any other advice, or must I decline her?

The scholars, and amongst them Imam Ibn Baz, allowed speaking with a woman by phone for buying and selling, without softness of speech and without anything that leads to fitnah. You know the nature of these calls better than me, so if they would lead to fitnah or something forbidden, then abandon them.