Yealink T27G - Page 17

Table of Contents
xiii
Jitter Buffer ..................................................................................................................................................................... 389
DTMF .......................................................................................................................................................................................... 392
DTMF Keypad ................................................................................................................................................................ 392
Transmitting DTMF Digit .......................................................................................................................................... 393
Suppress DTMF Display ............................................................................................................................................ 395
Transfer via DTMF ........................................................................................................................................................ 396
Local DTMF Tone ......................................................................................................................................................... 397
Voice Quality Monitoring (VQM) .................................................................................................................................... 397
RTCP-XR ........................................................................................................................................................................... 397
VQ-RTCPXR .................................................................................................................................................................... 398
Security Features ........................................................................ 407
User and Administrator Identification .......................................................................................................................... 407
User and Administrator Identification Configuration ................................................................................... 407
User Access Level Configuration ........................................................................................................................... 409
Auto Logout Time ................................................................................................................................................................. 409
Auto Logout Time Configuration .......................................................................................................................... 410
Phone Lock .............................................................................................................................................................................. 410
Operation Behaviors on Lock Phone ................................................................................................................... 411
Phone Lock Configuration ....................................................................................................................................... 412
Transport Layer Security (TLS) ......................................................................................................................................... 414
Supported Cipher Suites ........................................................................................................................................... 414
Supported Trusted and Server Certificates ....................................................................................................... 415
TLS Configuration ........................................................................................................................................................ 418
Secure Real-Time Transport Protocol (SRTP) ............................................................................................................ 421
SRTP Configuration ..................................................................................................................................................... 423
Encrypting and Decrypting Files ..................................................................................................................................... 424
Configuration Files Encryption Tools ................................................................................................................... 425
Configuration Files Encryption and Decryption .............................................................................................. 425
Contact Files Encryption and Decryption .......................................................................................................... 425
Encryption and Decryption Configuration ........................................................................................................ 426
Example: Encrypting Configuration Files ........................................................................................................... 429
Incoming Signaling Validation ........................................................................................................................................ 431
Incoming Signaling Validation Configuration ................................................................................................. 431
Advanced Features ..................................................................... 433
Call Pickup ................................................................................................................................................................................ 433
Directed Call Pickup .................................................................................................................................................... 433
Group Call Pickup ........................................................................................................................................................ 437
Call Completion ..................................................................................................................................................................... 438
Call Completion Configuration .............................................................................................................................. 441
Example: Using Call Completion ........................................................................................................................... 441