A PSTN Multi-line extends the PSTN to multiple sockets allowing you to promote a single number, yet make and receive multiple calls. Its application is very straight forward and can allow you to connect multiple phones to the sockets without the need for a PBX. Should you wish to transfer calls between the various handsets then this is where a PBX can start to handle these calls for you. The moment you need 4+ lines, or you require multiple phone numbers (DDI) you are ready to make the jump to ISDN.
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