Multiple Socket CPU high

[ruban22]

In an incoming call scenario, when the iOS app in background or in locked screen mode, we are getting the initial PushKit notification ( the ghost call) and in between getting the real call, the Sofia stack is creating multiple sockets which are left dangling and we have 200% CPU usage and then crash which seem to user like call has terminated.

In a very simplified form this is what is happening

1. PushKit comes.
2. Stack tries to make socket to the non-existent call
3. Application via stack tells server “I’m here send me SDP”
4. Stack makes new socket every 500ms until SDP comes from server - this could be 5 seconds (or more) so we have ten sockets open
5. We get the SDP and make a proper socket connection. We now have one socket that is doing a call and the rest are still there doing their socket things chewing up CPU.

Appreciate how we can handle this when we get incoming call on IOS via PushKit?