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== List of known VoIP Phones that are not proprietary in that they are compatible with the majority of VoIP providers as of 2020 ==* 3COM 3108 Wireless Phone* Aastra 6730i/6731i VoIP Phone* Cisco 88XX & 68XX series* Cisco Linksys SPA942 NA* Cisco SPA525G* Cisco IP Phone 7940/7960* Cisco SPA30x and SPA50x series IP phones* Fanvil X4G* FortiFone FON-570* FortiFone FON-375* FortiFone FON-175* Gigaset A510 IP* Grandstream DP715/DP710* Grandstream DP750/DP720* Grandstream GXP2120 IP Phone* Grandstream GXP2135 IP Phone* Grandstream GXP2170* Grandstream GXP2200* Konftel 300Wx-IP* Konftel 300IPx* Panasonic KX-TGP 550* Panasonic KX-HDV130C* Panasonic KX-HDV230* Panasonic KX-HDV330* Pirelli DP-L10* Positron IP304* Positron IP304C* Positron IP408* Positron IP410C* Positron IP410G* Gigaset C450-Ip* Snom 320 VoIP Phone* Snom m3 VoIP Phone* SNOM C520* SNOM professional D7XX* Vtech Conference Station* Vtech VSP Series* Yealink Voice Solutions* Yealink SIP-T28P (VSRF)* Zycoo ZP502