Bulk sms via selected gate if there are more then 1 gates!

I have 2 gates, one of them is kannel and other is asterisk (my dev, which can send sms at the time) .
AlsoI have group of phone contacts at phone book with numbers in international format (i. e. +799…) .
And I have also outgoing sms route rule which send out sms via kannel if 00 prefixed before number +799… and via asterisk if 99 is set up.

For single sms it woks.

But how do it working for sms for group (bulk sms) ?
That is sms for group would be sent via kannel if 00 is prefixed.