[reSIProcate] How registration is refreshed?

[Dmytro Bogovych]

Greetings.

I work on iOS VoIP resiprocate based application.
In order to support background mode let me ask a few question.

The first one is
- what is the interval for registration refreshing? Half of registration
time? Quarter of registration time? Can I change it?

iOS provides quants of time to refresh application state each 600 seconds -
so I use TCP transport to avoid UDP/NAT/lifetime issues.
But would be great if application refresh its registration in these quants.
It is a reason for my first question.

The second question - what is the lifetime for TCP connection used for
registration?

I saw GC capability in source code but it is disabled by default (this is
good for me).
I pass the connection's socket to iOS to track the data on it and bring the
application if new data (incoming call/message) are available.

Thank you!
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