asterisk: add page (#4474)

pages/linux/asterisk.md

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+# asterisk
+
+> Telephone and exchange (phone) server.
+> Used for running the server itself, and managing an already running instance.
+> More information: <https://wiki.asterisk.org/wiki/display/AST/Home>.
+
+- [R]econnect to a running server, and turn on logging 3 levels of [v]erbosity:
+
+`asterisk -r -vvv`
+
+- [R]econnect to a running server, run a single command, and return:
+
+`asterisk -r -x "{{command}}"`
+
+- Show chan_SIP clients (phones):
+
+`asterisk -r -x "sip show peers"`
+
+- Show active calls and channels:
+
+`asterisk -r -x "core show channels"`
+
+- Show voicemail mailboxes:
+
+`asterisk -r -x "voicemail show users"`
+
+- Terminate a channel:
+
+`asterisk -r -x "hangup request {{channel_ID}}"`
+
+- Reload chan_SIP configuration:
+
+`asterisk -r -x "sip reload"`