It is becoming increasingly common for telecommunications providers to use VoIP telephony over dedicated and public IP networks to connect switching stations and to interconnect with other telephony network providers; this is often referred to as "IP backhaul".[5][6]
Smartphones and Wi-Fi enabled mobile phones may have SIP clients built into the firmware or available as an application download. Such clients operate independently of the mobile telephone phone network and use either the cellular data connection or WiFi to make and receive phone calls.
Smartphones and Wi-Fi enabled mobile phones may have SIP clients built into the firmware or available as an application download. Such clients operate independently of the mobile telephone phone network and use either the cellular data connection or WiFi to make and receive phone calls.
