Intercom

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

• Telecommunications Companies
• Wireless Communications

North American Industry Classification System (NAICS) Categories:

• Wired Telecommunications Carriers > Telecommunications Companies
• Wireless Telecommunications Carriers (Except Satellite)

Standard Industry Classification (SIC) Categories:

• Radiotelephone Communications > Cellular & Mobile Telephone Service
• Telephone Communications, Except Radio > Telecommunications Companies