invention reveals to the ua the target address used to contact the ua which was previously hidden there may be circumstances in which it would be undesirable to reveal this information to the ua in which case the home proxy should remove the header or other indication containing the target address the invention allows corporate networks and receiving ues to know under which target identity a request was forwarded only the relevant target identity need be retained and not a history of request uri rewrites this improves the efficiency of bandwidth usage and processing furthermore the invention does not interfere with the existing routing mechanism and is compatible with home proxies that do not support loose routing there is no need for entities using the mechanism to have knowledge whether the next hop supports it and there is no need for the terminating ua to inform its home proxy whether it supports the mechanism or not the invention does not require the terminal to support loose routing and so is backwards compatible in a scenario in which one of the traversed proxies does not understand the mechanism routing will still succeed as the routing mechanism of sip itself is not changed the worst thing that can happen is that a terminating ua might receive incorrect information about the intended target identity by which it has been reached the target header might carry information identifying a forwarding party where the forwarding party does not want to reveal its identity the invention is fully backward compatible with mgcfs that use the request uri value for mapping and routing towards a pstn network according to the interworking procedures described in rfc3398.