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4G IP fixed wireless phone ① 4G VOLTE phone ② 3 ways audio conference ③ 2.4 inch color screen ④ Support SIP 2.0 (RFC3261) ⑤ Built-in WIFI Bluetooth(IEE802.11 b/g/n) 2.4G ⑥ XML/LDAP remote phonebook ⑦ ...