French to English Marketing Retail ticketing

I'm translating a text about a ticketing company.

As far as I can make out from the context and my research, "vente déportée" (in this context at least) is when the ticketing software is loaded onto a mobile device such as a laptop or tablet so sales people can sell tickets outside of the ticket/box office.

You can find a further explanation of "vente déportée" at this weblink: http://www.digitick.net/un-module-integre-de-vente-deportee/

I'm not sure what the equivalent term for this type of sale is in English?

"mobile sales" doesn't seem appropriate as elsewhere in the text this is used to refer to sales made via the company's mobile phone apps. "Handheld" occurs to me, but this is only appropriate for tablets, not laptops....

Here are the sentences this term appears in FYI:

Ce matériel est robuste et de faible encombrement (parfaite aussi bien pour le guichet que pour la vente déportée).

XXXX est un logiciel client lourd qui s’appuie sur un moteur de base de données rapide et éprouvé : YYYY. Le logiciel s’adapte à tous types d’environnement – monoposte, client / serveur, TSE, Citrix – et de situations : festivals, multi-institutions, multi-régie de recettes, vente déportée.

Thanks in advance for any help you can give!