[daemon/ios]iPad stuck during long minutes

Related to https://git.jami.net/savoirfairelinux/ring-daemon/issues/227

Observations

Making calls to an ipad device. The connection is generally made without issue. But sometimes, the device is just not answering to any request during 10/15 minutes. Then it works like before

Hypotheses

• Don't receive anything from the proxy during X minutes?
• Daemon locked?