The invention discloses a method for establishing communication between a first party (C1) offering a service, and a second party (C2) needing said service, the parties being in respective LAN:s, unable to establish communication with each other. The first party registers with a switchboard function (SWB) which assigns it an address. The first party registers its address and its service with a name service (NS), and the second party notifies the name service that it desires to utilize a service, and the character of the service. The second party receives the address information to the first party from the name service, the name service having matched the desired service with the offered service, and the second party transmits all or parts of said address information to the switchboard function, with the switchboard function assisting in the establishing of communication between the first and the second party.