GXP1400/1405 IP语音电话机
nd)和iLBC,带内及带外DTMF
(in audio,RFC2833,SIP INFO)


协议
SIP RFC3261,TCP/IP/UDP,RTP/RTCP,HTTP/HTTPS,
ARP/RARP,ICMP,DNS(A record,SRV and NAPTR),
DHCP(client and server),PPPoE,TELNET,
FTP,NTP,STUN,SIMPLE,SIP over TLS,802.1x,TR-069


电话功能
呼叫保持,静音,转接,呼叫驻留,抢接,SCA
(shared-call-appearance)/ BLA(bridged-line-app
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