How start several process depending in the result of a connector REST-GET

I have a process that run fine using a Initiator that fills a phoneNumber and starts the process, but how can I start several of this process depending in the result os a REST GET, with a list of phoneNumbers? I try with iteration combined with connector, but I fund the correct way to make it work.

Assign parallel task to multiple groups and users


I have an interesting query: How can I have a human task be assigned and completed in a parallel way by a number of selected groups and/or users?

The idea is that the initiator would select a list of groups and specific users to assign a Human Task step to. Each group/user needs to be able to complete their copy of the task simultaneously to the others. The task should only be completed once everyone assigned has completed it.

Thanks in advance.