SP180 converts FXS port of VOIP to FXO. Once there is a ring from VOIP, if connect to the CO line immediately, so the user can dial out from CO line. In opposition, when the ring is from the CO line, it will connect to VOIP immediately. SP180 disconnects both sides when it gets busy tone.

It is ideal for Cisco ATA 186 or any other VOIP Gateway or PC Base Communication hardware like PCI Hotline or Phonejack. It helps to provide Auto conference facility between PSTN and VOIP.