Internal Telephone Service

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

• Computers Networks

North American Industry Classification System (NAICS) Categories:

• Computer And Software Stores > Multimedia & Networking Devices & Products > Networking Products

Standard Industry Classification (SIC) Categories:

• Computer And Computer Software Stores > Multimedia & Networking Devices & Products > Networking Products