Synchronous

Softphone and Push server will swap registration as the softphone is backgrounded and brought to the foreground again.

Softphone backgrounded or closed

Step1

When the softphone is backgrounded or closed the softphone will immediately unregister with the PBX

Step 2

SIP credentials are securely transferred to the Push server

Step 3

Push server registers SIP account with the PBX

Softphone application opened or foregrounded

Step 4

Request made to Push server to unregister the given SIP account and remove credentials

Step 5

Push server unregisters SIP acccount with PBX. At this point neither the softphone application nor Pushserver are registered.There is thus a small time window where incoming calls may not be received.

Step 6

Softphone brought to foreground and registers with PBX