Key specifications of the om20g-2s/2o:
built-in analog ports: 2 fxs ports (for analog phones/fax) and 2 fxo ports (for pstn lines).
capacity: supports up to 20 ip extensions/users.
concurrent calls: supports up to 20–24 concurrent calls.
sip trunks: supports up to 24–54 sip trunks.
networking: 2 x 1000 mbps (gigabit) ethernet ports.
protocol: sip.
recording: supports local recording, voicemail, and auto-provisioning.
hardware features: dual-core 880 mhz cpu, 256 mb ram, 16 mb flash, and 16 gb internal usb storage.
with remote access