If you connect a gateway with a SwyxWare, please refer to following KB articles:

HOW TO: SwyxON: How to connect a LANCOM 1783 VA to a UC Tenant (VPN information) (kb5069)

INFO: SwyxON: IPsec VPN parameters for VPN clients (kb5073)

INFO: Configuration of Swyx with gateways in order to connect to SIP Providers (kb5074)