If you use No-IP.com, you will need to signup for No-IP.com's "Plus Managed Domains" service. Once registered, Modify your No-IP Plus Managed Domain, click on Manage Advanced Records, then Manage SRV Records. To create the SRV record, follow this template replacing junctionnetworks.com with your domain:
Select the appropriate host from the drop down list and configure the rest of the record so it matches the information above. Then create the record.