hi all,

Swisscom will discontinue the old GSM service soon, so I'll need to replace an old gateway.

Any recommendation will be appreciated. I'm looking for a ready-made voice gateway, as follows:

* 4 or 5 SIM card slots

* support for VoLTE and UMTS (in Swiss frequency bands)

* Voice calls routed via SIP

* API for receiving SMS

* Nice to have: support for OpenVPN or some other VPN.

thanks,

stan

--