Editing IP Multimedia Subsystem (section)

=== Access network ===
The user can connect to IMS in various ways, most of which use the standard IP. IMS terminals (such as [[mobile phone]]s, [[personal digital assistant]]s (PDAs) and computers) can register directly on IMS, even when they are [[roaming]] in another network or country (the visited network). The only requirement is that they can use IP and run SIP user agents. Fixed access (e.g., [[digital subscriber line]] (DSL), [[cable modem]]s, [[Ethernet]], [[Fiber to the x|FTTx]]), mobile access (e.g. [[5G NR]], [[LTE (telecommunication)|LTE]], [[W-CDMA]], [[CDMA2000]], [[GSM]], [[GPRS]]) and wireless access (e.g., [[Wireless LAN|WLAN]], [[WiMAX]]) are all supported. Other phone systems like [[plain old telephone service]] (POTS—the old analogue telephones), [[H.323]] and non IMS-compatible systems, are supported through [[VoIP gateway|gateway]]s.