handle domestic_prefix of 0, RT#11390

diff --git a/FS/FS/part_pkg/voip_cdr.pm b/FS/FS/part_pkg/voip_cdr.pm
index 3996b8b..f4741ab 100644 (file)
--- a/FS/FS/part_pkg/voip_cdr.pm
+++ b/FS/FS/part_pkg/voip_cdr.pm
@@ -473,7 +473,7 @@ sub calc_usage {
             }
 
           } else {
-            $countrycode = $domestic_prefix || '1';
+            $countrycode = length($domestic_prefix) ? $domestic_prefix : '1';
             $number =~ s/^$countrycode//;# if length($number) > 10;
           }