If you have no dial tone, try the following steps:
- For analogue handsets, ensure the phone is directly connected to the phone port of the ATA (Analogue Telephone Adapter), or VoIP Modem. E.g. Cisco SPA122, Mitron MV1, TP-Link TD-VG3631
- For desktop IP handsets, ensure the phone is connected to your network, either to a modem/router or a switch and is powered on.
- Ensure the internet connection your phone is connected to is working.
- Reboot your network in a sequential sequence. Power down all devices, then turn on each device in order starting from the Modem/Router then onto the Phones/ATA.