Yealink SIP-T4X Administrator's Manual page 24

Administrator's Guide for SIP-T4X IP Phones
identity, auto answer.
- Advanced Features: BLF, server redundancy, distinctive ring tones, remote
phone book, LDAP , 802.1X authentication.
Codecs and Voice Features

- Wideband codec: G.722
Narrowband codec: G.711, G.723.1, G.726, G.729AB, GSM, iLBC.
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VAD, CNG, AEC, PLC, AJB, AGC
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Full-duplex speakerphone with AEC
-
Network Features

- SIP v1 (RFC2543), v2 (RFC3261)
- IPv4/IPv6 support
NAT Traversal: STUN mode
-
DTMF: INBAND, RFC2833, SIP INFO
-
- Proxy mode and peer-to-peer SIP link mode
- IP assignment: Static/DHCP/PPPoE (PPPoE is for SIP-T48G/T46G only)
TFTP/DHCP client
-
HTTP/HTTPS server
-
- DNS client
- NAT/DHCP server
Management

FTP/TFTP/HTTP/PnP auto-provision
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Configuration: browser/phone/auto-provision
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Direct IP call without SIP proxy
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Dial number via SIP server
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- Dial URL via SIP server
Security

HTTPS (server/client)
-
SRTP (RFC3711)
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- Transport Layer Security (TLS)
VLAN (802.1q), QoS
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Digest authentication using MD5/MD5-sess
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Secure configuration file via AES encryption
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- Phone lock for personal privacy protection (not applicable to SIP-T48G)
- Admin/User configuration mode
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