* Update code to iterate over numbers.
This code fixes some problems
* range like `009-010` current code produce numbers `009` and `0010`
* range like `200-100` now raise error so it will be easy to debug
* range like `010-20` now generate error.
* `destination` is string so condition `destination == tonumber(sip_from_user)` is always false so change it `destination == sip_from_user`
* Fix. handle ranges like `100-100`