... is highly integrated router, NAT, phone gateway functionality and has market-leading voice quality, rich functionality, and lightweight, compact design ... Three-way conference . Support PPPoE client , ensure voice service quality , remote management and maintenance. It is capable to work ... ,NTT, and, DTMF-based CIDPolarity ReversalYesHomologationSafetyULComplianceFCC,CE VoIP SIP Gateway With 32FXS Ports