No such command 'sip reload' when using asterisk 18
Solution 1:
In Asterisk 18 the module chan_sip.so is set to noload in the modules.conf file.
If you want to autoload the module just comment the line by adding ";" in front of noload = chan_sip.so
[/etc/asterisk/modules.conf]
;
; Do not load chan_sip by default, it may conflict with res_pjsip.
;noload = chan_sip.so
;