def METHOD_NAME(self, body):
    def _replace_recursively(obj):
        if isinstance(obj, dict):
            for key in obj:
                value = obj[key]
                if key in self._keys:
                    obj[key] = self._replacement
                elif key == "iceServers":
                    _replace_recursively(value[0])
                elif key == "urls":
                    obj[key][0] = "turn.skype.com"
                else:
                    _replace_recursively(value)
        elif isinstance(obj, list):
            for i in obj:
                _replace_recursively(i)
    import json
    try:
        body = json.loads(body)
        _replace_recursively(body)
    except (KeyError, ValueError):
        return body
    return json.dumps(body)