A misconception because after all, VoIP and Internet Telephony use a completely different signalling system to traditional telephony. Therefore a different device must be required to convert those signals into the sounds that make up a telephone conversation. However, it is now possible to install a device; a VoIP gateway between the IP network and existing phone systems that converts the signalling from one to the other.

The VoIP gateway has two distinct roles. The first is to convert the signal so that a person using an IP device can talk to one on a traditional TDM device and vice versa. The second role is to manage the network signalling and routing.

For example, all IP devices, including phones, have an IP address while traditional telephones, even extensions on a company phone system, have their traditional telephone number. If a company has connected its traditional telephone system to an IP network, then incoming calls from the IP network will be looking for an IP address. The gateway