What does "non-IP" originated traffic mean in a TOS?

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http://serverfault.com – I am looking at VoIP providers and many of them have a part of their TOS that says they don't allow "non-IP originated traffic." Excerpt from TOS: You shall only send to [DELETED COMPANY NAME] network traffic which is originated via Internet protocol (“IP”). Your causing, transmitting, or routing of any non-IP originated traffic to our network may result in the immediate termination of Service by us, in our sole discretion, without prior notice to you. You agree to indemnify and hold us, our Affiliates and subsidiaries, employees, directors, officers and shareholders of th (HowTos)