asterisk18 is running.
However, asteirsk11 does not operate. Start-up will be.

When you dial from the soft phone, immediately Asterisk is killed.
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Disconnected from Asterisk server
Asterisk cleanly ending (0).
Executing last minute cleanups
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If Do you have you are using a Asterisk11?

Model    Buffalo WZR-HP-G300NH
Firmware Version    OpenWrt Chaos Calmer 15.05.1 / LuCI 15.05-149-g0d8bbd2 Release (git-15.363.78009-956be55)