How to prohibit the replacement of "+" with 00

1. Go to the “System” section -> “System file customization”

"System file customization" section

1. Select the file “/etc/asterisk/extensions.conf” to edit.

"Extensions.conf" file

1. Select the “Add to end of file” mode.

“Add to end of file” mode

1. Add the code to the second field:

[outgoing](+)
exten => _+X!,1,Set(ADDPLUS=+);
    same => n,Goto(${CONTEXT},${EXTEN:1},1);

Save settings.

Code for "extensions.conf"

Now it's done 🎉