Built-In 8ch VoIP Resources... • Built-In 4ch VRS/VM (InMail) capability • 2 hours VRS/VM (InMail) storage without SD Card • Four clients of Mobile Extension • Maximum Four participants of Web Video Conference • One Voice Prompt of VRS/VM (InMail) as default - Default Language: UK English • One VoIPDB daughter board connector • One Ethernet (100M) port (RJ45) • One EXIFB daughter board connector • One SD Card slot (for expand VRS/VM storage) • 4 pcs of SL2100 IP TRUNK-01 LIC and 4 pcs of SL2100 IP EXT-01 LIC are bundled Brand