| 摘要 |
The present invention provides a combined user agent (CUA) to represent a telephony device supported by a private branch exchange (PBX), which is connected to a public domain telephony switch, and a packet-based media device as an integrated group to other network entities. The CUA is configured to facilitate the necessary call signaling to establish and control a voice call via the PBX and an associated telephony switch, as well as the session control signaling necessary to establish and control a media session with the media device. Accordingly, the telephony device and media device appear to the network devices as a single device having voice and media capabilities, wherein the voice capabilities are controlled in part by the telephony switch and PBX.
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