what is the best approach to follow when i want the user to submit at least one contact info (either Email or Telephone)

I am working on a web site which have a Contact Us form with these 5 fields:-

• Name (Required)
• Telephone
• Email
• Country (Optional)

now I am showing a red * beside the Name since it is required.. but at the same time I want the user to provide at least one contact info either Telephone or email.. now if I add two red * beside the Tele & email users will think that they should provide both... so can anyone advice how I need to inform the users that they need to submit either email or telephone (or both of them), before submitting their form ?