Teltrust Corporation is also listed under the following categories: Standard Yellow Pages Heading (SYPH) Categories:

• Telecommunications Companies
• Telecommunications Services

North American Industry Classification System (NAICS) Categories:

• Wired Telecommunications Carriers > Telecommunications Companies
• Wired Telecommunications Carriers > Telecommunications Services

Standard Industry Classification (SIC) Categories:

• Telephone Communications, Except Radio > Telecommunications Companies
• Telephone Communications, Except Radio > Telecommunications Services