| http://www.w3.org/ns/prov#value | - According to the present invention, proprietary information related to the control of PBX features, including features such as call transfer and conferencing, is transmitted from an originating PBX to a destination PBX using a user-user signaling (UUS) service over the public ISDN. The proprietary information transmitted in user-user signaling service data packets does not undergo manipulation dur
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