Node component(s) of apparatus in one example, upon registration of user(s) in second network subsequent to registration of one or more of user(s) in first network, serve to cause mailbox profile portion(s) for voice mailbox(es) that are associated with one or more of user(s) to be copied from first voicemail system component(s) that are associated with first network to second voicemail system component(s) that are associated with second network contemporaneous with location of voicemail message(s), for one or more of user(s), on storage device(s) that are coupled with second voicemail system component(s) through internet protocol network. Mailbox profile portion(s) comprise address(es) for location(s) on storage device(s) that serve to allow one or more of user(s) to employ voice mailbox(es) on second voicemail system component(s) to access one or more of voicemail message(s) on storage device(s).