| 摘要 |
A system for establishing a voice and signaling link through a PBX system from an remote telephone device includes a PBX system, a setless gateway, and an remote telephone device. The PBX system is coupled to a public switched telephone network (PSTN) via a trunk connection. The PBX system is also coupled to the setless gateway via a digital phone port, which includes a first bearer channel B1 and a second bearer channel B2. DTMF tone sequences from the remote telephone device are decoded by the setless gateway, which acts as a proxy to the PBX system. The setless gateway routes voice and signaling from the second bearer channel B2 to the first bearer channel B1, so as to extend the remote telephone device from the PBX system.
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