... newest 1~2 FXS ATA (Analogue Telephone Adapter) products in Flyingvoice, which enables customers to register to different SIP Proxy ... size, excellent voice quality, packed feature functionality and best-in-class price-performance point enable consumers to maximize the power ... on hold, Call hold/forwarding/mute/transfer/waiting Caller ID and CWCID, DTMF Relay- In-band, Out-band and SIP infoHotline, Short ...