How to prohibit the replacement of "+" with 00

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

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

1. Select the “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.