Yealink SIP-T46U. RTCP-XR, VQ-RTCPXR, SIP, SIP v2, SRTP. Multiple VoIP protocol support, integrated Ethernet switch. VoIP Protocols. VoIP phone. Conference Call Capability. Voice Codecs. Headset jack / RJ-9 ¦ Handset jack / RJ-9 ¦ 2 x USB.
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