There are three options when you have multiple phone numbers:
1. Don't tag phone number, leave Run As field blank. A round-robin will occur and Sakari will pick one of the available phone numbers. When a conversation is started with a contact, it will persist on that thread until the conversation is closed.
2. Tag the phone number with contact owner name/email. Use the contact owner token in the Run As field. The assigned phone number will be used.
3. Tag the phone number with some other tag (e.g. customer service, sales, California, New York). Use that tag in the Run As field. The assigned phone number will be used.