Description:

This article provides the telephone prefixes assigned to CSU users and dialing instructions when using VoIP phones and other analog devices.

Note: This information applies to making calls using VoIP phones. For information on using Teams Voice, see Getting Started with Teams Voice: Making and Receiving Calls.

Applicable to:

• Fort Collins faculty and staff who use VoIP phones and other analog devices

CSU Prefixes

CSU telephone numbers are assigned within the following range of telephone prefixes:

Dialing Instructions

Dial only the last five digits (7+xxxx, 1+xxxx, 2+xxxx, 5+xxxx) when calling from campus. All numbers are in the 970 area code.

CSU Phone Numbers

Dial 5 digits of the University number (1+xxxx, 7+xxxx, 2+xxxx, 5+xxxx)

Non-CSU Phone Numbers & Long Distance

Dial 1 + Area Code + 7-digit number for all off-campus calls (1+xxx-xxx-xxxx)

* Please note that Guam is part of the US dialing plan.

Faxing and other Analog devices

Dial 8 + 1 + Area Code + 7-digit number for all off-campus calls (81xxxxxxxxxx)

International Calls

Dial 8+011, country code, city code, and telephone number. For international calls using a calling card, dial 8+00, and the operator will connect you to an international operator.

Toll-Free

Dial 1 + area code + 7-digit number

Related Resources

• Relay Colorado: a statewide service that connects standard (voice) telephone users with Deaf, Hard of Hearing, DeafBlind, Speech-Disabled, or Late-Deafened people who use Teletypewriter (TTYs) or Voice Carry-Over (VCO) phones.
• CSU Directory