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== Yealink SIP-T21 ==VoIP Phone w/ 2 Lines, HD Voice*HD Voice: HD Codec, HD speaker, HD handset*132 x 64-pixel graphical LCDHD Voice: HD Codec*XML/LDAP remote phonebook*Two-port 10/100 Ethernet Switch*HD handsetXML/LDAP Phonebook * [https://wiki.voip.ms/article/Yealink_Voice_Solutions VoIP.ms compatibility]