The Nistel is equipped with up to 8 analog ports and 2 Ethernet interfaces, allowing seamless integration of VoIP trunks and existing PSTN lines. Additionally, the Nistel supports a wide range of codecs and signaling protocols, including G711 (alaw/ulaw), G722, OPUS, AMR-NB/WB, SILK, G723.1, G726, G729, GSM, ADPCM, iLBC, H263, H263P, H264, and VP8. Thanks to its Quad-Core processors, the NISTEL IPBX can easily handle 75 simultaneous calls and up to 300 registered extensions — all in a compact chassis.