Flexisip

Flexisip is a complete, modular, and scalable SIP server that uses its included push gateway to deliver incoming SIP calls or text messages to mobile devices. It is for SIP deployments on mobile device platforms that require push notifications when an app is not active in the foreground. In that state, the gateway provides the push path needed for the device to receive information about an incoming call or message. The SIP server and push gateway are included together, giving deployments a single program for these connected tasks. Flexisip is limited by the notification rules of the mobile platform. When a platform requires push notifications for an app outside the foreground, delivery still depends on that required push mechanism. Flexisip supports that dependency through its gateway; it does not remove the platform requirement itself.