IP Phone

Voice over IP (VoIP) technology is used by IP phones to enable making phone calls online rather than through a landline. Session Initiation Protocol (SIP), for example, is utilized as a control protocol. IP phones offer a number of advantages over traditional telephones that do not. Call park, call forwarding and transferring, conference calling, accurate caller ID, and other features are among them, but they are by no means restricted to these.

4G router support IP phone- (VoIP) technology,such as huawei 4G wireless router B311s-220

https://www.qs-wifi.com/4g-lte-cpe-router/unlocked-huawei-b311-4g-lte-cep-wifi-router.html

VOIP

* Huawei Firmware Over the Air(HOTA)

* Software Features: VOIP, VPN, DHCP and DDNS. Gigabit Ethernet port