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SIP call signaling RFC3261 with backward compatible with
¡@RFC2543
RTP (RFC1889), RTCP (RFC1890)
SDP (RFC2327)
NAPTR for SIP URI lookup (RFC2915)
DHCP
PPPoE
TFTP/HTTP for Auto Provisioning
IEEE 802.1Q VLAN
SNTP for network time synchnization
Media Encription ¡V AES, HMAC MD5, HMAC SHAI
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Codec: G.711 (a-law and u-law), G.723.1/A, and G.729A/B.
Line Echo Cancellation
VAD (Voice Activity Detection)
CNG (Comfort Noise Generation)
Packet Lost Concealment
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