Do you have a question about the Yealink T42 and is the answer not in the manual?
XML Phonebook | Yes |
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Wall Mountable | Yes |
Display | 2.7-inch grayscale LCD with backlight |
Audio Features | HD voice, Full-duplex speakerphone |
Protocol Support | SIP |
Headset Support | RJ9 headset port |
Power Supply | IEEE 802.3af PoE or 5V DC adapter |
Voice Codecs | G.722, G.711, G.723, G.729 |