As you probably know, Boundary comes with number of predefined Actions, which allow you to notify via email, PagerDuty, HipChat and more. We are going to add additional actions in the future but a way that you can create your own is by leveraging URL Action (a.k.a. WebHook) with 3rd party services.
For example, if you'd like to send alerts over SMS there are several web services which allow you to automate actions based on other actions. Our users reported success using Zapier and IFTTT. Those services have hundreds ready-to-use Recipes and Zaps.
Here are some examples you can use to get yourself going with either service:
Search for more recipes if your have special requirements or create and share your own. If you are proud of your Recipe or Zap please share it with us and the community by posting here or emailing us: firstname.lastname@example.org