[c-nsp] bgp communities over vpn mpls

[danger will]

Hello List,

Lets say the customer wants to use his own bgp communities over a vpn mpls service.
Prefixes from one site are market with some communities , and those communities have an action at another site. The question is are these communities maintained over the vpn mpls service or is there any reason for them to be deleted by the mpls provider ?

Thank you very much