In this paper we evaluate a direct controller pilot communication (DCPC) party-line voice solution utilizing voice over IP (VoIP) over a packet switched satellite service, Inmarsat's mobile packet data service (MPDS). This solution provides a low cost, moderate latency, party-line voice service for oceanic and remote regions. The results of VoIP experimentation over an actual MPDS terminal, OPNET simulations, and lab emulations of party-line voice are used to evaluated the proposed solutions feasibility.