Ringback Number - Ringback Numbers

Ringback Numbers

4101 was formerly valid on some mechanical switching systems to allow a call to the other party on a two-party line. Like 4104 (repair, long replaced by 611 in most cities), it was once a standard number in many areas but has disappeared as this equipment (and the party line service itself) is decommissioned.

Most other numbers listed for ringback are specific to one exchange or one telco; available lists tend to be outdated and unreliable. The information is not current as many former test numbers (such as 320 and 999 in Bell Canada territory) have been reclaimed for use as standard landline or mobile exchange prefixes, with the test codes moved (usually) to the 958 exchange.

• Vertical service code *5505 ringback
• 305-780-6095 Ringback for Miami, Florida
• 320-XXX-XXXX Ringback for Montreal, Quebec. (deprecated, 320 is no longer a test exchange in Bell Canada territory)
• 507-XXX-XXXX Ringback for Alberta.
• 590-XXX-XXXX Ringback for (204) NPA.
• 777-XXX-XXXX Ringback for Indiana.
• 847-765-1008 Ringback for Chicago area codes.
• 954-780-6321 Ringback for (954) NPA.
• 954-999-XXXX Ringback for (954) NPA.
• 999-XXX-XXXX Ringback for (519) NPA. (deprecated, 999 is no longer a test exchange in Windsor)
• 999-XXX-XXXX Ringback for North Bay, Ontario (705) (deprecated, 999 is no longer a test exchange in Barrie/North Bay)
• 999-XXX-XXXX Ringback for Ottawa, Ontario (613) (deprecated, 999 is no longer a test exchange in Ottawa)
• 999-XXX-XXXX Ringback for portions of Toronto, Ontario (416) (deprecated, 999 is no longer a test exchange in Toronto)
• 970-99X-XXXX Ringback for Greeley, CO main exchange (970)