public MultiMap<string,ImFieldDetails> im_addresses { set; get; }

A mapping of IM protocol to an (unordered) set of IM addresses.

Each mapping is from an arbitrary protocol identifier to a set of IM addresses on that protocol for the contact, listed in no particular order.

There must be no duplicate IM addresses in each set, though a given IM address may be present in the sets for different protocols.

All the IM addresses must be normalised using ImDetails.normalise_im_address before being added to this property.