E1/T1
A European format for digital transmission. E1 supports signals at 2 Mbps (32 channels at 64Kbps, with 2 channels reserved for signaling and controlling), versus the T1, which carries signals at 1.544 Mbps (24 channels at 64Kbps).
SoundPoint IP 321/331 is a SIP phone with 2-line support, which has excellent quality of sound and the wide range of IP telephony features. SoundPoint IP 321 has one 10/100 Ethernet port (331 model has two ports), through which it can be used in areas such as lobbies, hallways, resting rooms. You can also mount this device on the wall.
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