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Thanks. Inside wins out over internal by a whisker for my specific context. Pleasantly surprised to have generated so much debate over an apparently simple term once again! 4 KudoZ points were awarded for this answer
IMHO, there is no need to make any assumptions about what this means: it refers to the staff in the office whose task is to support the team on the road - and part of their task is to take orders by telephone, make promotional phone calls, and organise samples etc for the outside sales people. It can include a dedicated telesales team, but the FR term for that is usually "télévente" so I don't think this is necessarily covered by the present case.
It's a perfectly standard sales function, and I don't believe we need to go inventing new terms for it when the EN equivalent already exists.