Yealink SIP-T58W. Product type: IP Phone, Product colour: Grey, Handset type: Wired handset. Dual-Tone Multi-Frequency (DTMF) modes: In-band, Out-of band, SIP info. Phonebook capacity: 1000 entries. Display: LCD, Display diagonal: 17.8 cm (7"), Display resolution: 1024 x 600 pixels. Voice codecs: G.711a, G.722, G.723.1, G.726, G.729, G.729A, G.729B, iLBC