Microsoft Lync Server (previously Microsoft Office Communications Server) is an enterprise real-time communications server, providing the infrastructure for enterprise instant messaging, presence, file transfer, peer-to-peer and multiparty voice and video calling, ad hoc and structured conferences (audio, video and web) and, through a 3rd party gateway or SIP trunk, PSTN connectivity.

MyPBX is a standalone embedded hybrid PBX for small businesses and remote branch offices of larger organizations. MyPBX offers a hybrid solution (a combination of VoIP applications using legacy telecom equipment) alternative for enterprises.

MyPBX has been tested as a gateway to Lync Server/OCS. Connected to MyPBX, Lync Server/OCS has access to PSTN/GSM/UMTS/ISDN network.

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