PUSH is a service responsible for delivery of notifications to a mobile device and is natively supported by operating systems. Voipswitch RCS platform supports following PUSH services:

Apple APNS
Android GCM
Windows Phone
Blackberry

The purpose of using PUSH notifications in the RCS platform is to ensure communication with the client. When the RCS application is open it registers to the SIP server so all SIP requests can be delivered directly. When the application is closed or for some reason lost registration with the server the only way of communicating with client is to send him PUSH notification. Also in the Windows Phone version when the application goes to background it cannot keep any network connectivity with the server and therefore it always uses PUSH when not in foreground.

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