We using 1.4.18 (x86_64, rpm version on CentOS 6) with TLS SIP profile with Cisco SPA 303/504 with firmwares 7.4.9c up to 7.5.7s (no matter).

When phones lost connect to servers (network problems) Cisco phones after few seconds not responding.

And we need to reset phones with turn off/on power.

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Can FreeSWITCH play role on phones that not responding after loss connection to FreeSWITCH or this is problem only Cisco SPA phones?

Maybe anybody know how we can solve this problem.