Known Limitations - Yealink T2 Series Quick Start Manual

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2/28/2019

Note: Ensure that the input mode is set to digits (red box).

Step 4: Extended Phone Configuration

IP phones can be tweaked to match the user's needs. Those might be skipped if they are not desired and the

phone will be rolled out in a default configuration. Also they can be altered at a later stage and changes

applied via the Management Console → Phones → Select Device → Re-Provision :

●

IP Phone Configuration

●

IP Phone BLF/DSS

●

IP Phone Vlan

●

Customizing the IP Phone background logo

Known Limitations

1. End Of Life models:

● No support for CTI via uaCSTA

● No direct UI login

● No Hot desking

● Incompatible with secure "SSL Transport and Ciphers" setting

2. T21P additional limitations:

● No support for "Let's encrypt"

(certificate check needs to be disabled manually if used as remote extension)

● Extension setting must be set to "PBX Delivers Audio"

● Russian language is not available

● In STUN provisioning assign a minimum of 12 RTP ports

2. When using page switching with the EXP20 expansion module on:

● T27P/G: leave BLF 22 and 42 blank on first module, and 62 and 82 blank on second module.

● T29G: leave BLF 28 and 48 blank on first module, and 68 and 88 blank on second module.

https://www.3cx.com/sip-phones/yealink-t20p-t22p-t26p-t28p/

Provision your Yealink T2 series IP Phone for 3CX v15

Options, configurable per device of the extension

assignment, global for all devices of the extension

management, configurable per device of extension

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