VoIP Cookbook: VoIP Troubleshooting
In general, a VoIP communication will include receive the analog voice from telephone handset, digitized, compression, packetized, sent it over the network, decode, and reconstructed into voice at the other end.
Packet network used for the job can be based on IP, ATM, Frame Relay, thus, it is logical to use the term “Voice over” includingVoIP, VoATM, VoDSL, VoCable, VoP etc. We can use all the term for VoIP.
IP Phone is usually used in the process of digitalization, compresion, and packetization internally within the phone and the produced packet is sent over the Ethernet LAN.
IP Gateway is an interface for analog telephones or digital telephones or TDM trunk to convert its audio signal to VoIP Packet. An IP PBX or Enterprise Gateway may be used by an enterprise to connect IP Phone to conventional telephone network. A trunk gateway usually used by a company to connect analog phone lines to VoIP.