Is it possible to set up distinctive ringing on SNOM handsets (M25) to differentiate between internal and external calls?
The SNOM base station (M300) is registered with an 3cx server.
Please note that the phones support Alert info ringing for external and Queue calls but the ring tone is fixed and cannot be changed. So the phone should sound different if a external call is received that the internal ring tone. https://www.3cx.com/sip-phones/snom-m300-m700-dect/#h.8owp0itk5r99