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The SIP-T46S uses SIP over Transport Layer Security (TLS/SSL), which is the latest network security technology.
The SIP-T48S has a seven-inch, 800 x 480-pixel, backlit- color touch screen, which enables a rich visual presentation
Built-in Bluetooth 4.2 and the built-in dual band 2.4G/5G Wi-Fi, keep up with the modern wireless technology.
You can turn your SIP-T58A into a video phone ready with an optional removable two-megapixel HD camera