Yealink SIP-T4X Administration Manual page 22

caller 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
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Narrowband codec: G.711, G.723.1, G.726, G.729AB, GSM, iLBC .
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- VAD, CNG, AEC, PLC, AJB, AGC
Full-duplex speakerphone with AEC
-
Network Features

SIP v1 (RFC2543), v2 (RFC3261)
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IPv4/IPv6 support
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- NAT Traversal: STUN mode
DTMF: INBAND, RFC2833, SIP INFO
-
Proxy mode and peer-to-peer SIP link mode
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- IP assignment: Static/DHCP/PPPoE (for SIP-T46G only)
TFTP/DHCP client
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HTTP/HTTPS server
-
DNS client
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- NAT/DHCP server
Management

- FTP/TFTP/HTTP/PnP auto-provision
Configuration: browser/phone/auto-provision
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- Direct IP call without SIP proxy
- Dial number via SIP server
Dial URL via SIP server
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Security

- HTTPS (server/client)
SRTP (RFC3711)
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- Transport Layer Security (TLS)
- VLAN (802.1q), QoS
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
Admin/User configuration mode
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Product Overview
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