Lines and SIP Accounts: Supports up to 4 SIP accounts and includes 4 multi-purpose line keys. Audio Features: HD audio on handset and speakerphone. Compatible with wideband codecs like G.722 and Opus for superior sound quality. Networking: Dual switched 10/100 Mbps Ethernet ports (GRP2612). PoE support available on the GRP2612P, GRP2612W, and GRP2612G. GRP26...