ks by enabling interoperability of IP networks with conventional (legacy) telecommunications equipment. Users can establish native H.323 data, voice, fax, or video sessions on a private network without a H.450 gateway as long as both endpoints support the H.450 protocols and the users subscribe to the services. However, the availability of such services in on calls between networks requires such capabilities across the entire signaling path of the call. Moreover, service providers may adopt business models in which they not only charge per call duration, but also per service. Users can attach legacy telephone and fax devices to an H.323 network with terminal adapters that provide similar functionality to the H.323 gateway. Such a device implements the H.450 supplementary services, and communicates with the legacy device with DTMF tones over the analog interface. The H.450 protocols are simplifying the migration from proprietary PBX and service provider systems to server-based open standards based systems. Some of the basic services are as follows: Multiple Call Handling-Enables a multimedia client to handle multiple calls concurrently. N-way Conferencing-Enables establishment of multi-party conferences. Call Transfer (H.450.2)-Enables manual forwarding of a call to a third party. Call Forwarding (H.450.3)-Includes Call Forwarding Unconditional, Call Forwarding Busy, Call Forwarding No Reply, and Call Deflection. Call Hold (H.450.4)-Enables a user to transfer another user to a pending status and to resume the call later. Allows for music or messages on hold. Call Waiting (H.450.6)-Informs user, who is already on a call (or on multiple calls), that another call is coming in. Message Waiting Indication (H.450.7)-Enables a user to choose from a variety of methods (e.g., email, voicemail, or page) to be informed that he has received a message. Name Identification (H.450.8)-Provides the called party with the name of the calling party. Call Completion on Busy Subscriber and on No Reply (H.450.9)-Wher a called party is e