The present document provides a first set of standardized specifications for early deployments of DVB services over bidirectional IP networks. The phase 1 work is limited to MPEG-2 DVB services [1] encoded with MPEG-2 technology [63]@ [64] and encapsulated in MPEG-2 TS [62] and covers both Live Media Broadcast services (i.e. TV or radio styles) Media Broadcast with Trick Modes and Content on Demand services (CoD) (see also clause 6.2). These specifications define the mechanisms required in order for a consumer to be able to buy a standard DVB Home Network End Device@ take it home@ plug it into an IP network@ choose and consume DVB services available over the IP network. Clause 4 describes the architectural framework defined for this set of specifications and introduces the system reference model. The contents of the remaining clauses are described below.