Pulse to Tone converter for VoIP lines

About Dialgizmo

Dialgizmo translates pulse to tone dialling

The problem is that VoIP FXS ports (such as the phone line from your ATA or VoIP router) don't generally work with pulse dialing. In fact, not much built since the late 1980s works with pulse dialing. Pulse dialing tends to be unreliable over long distances, and pulse dialing is also slower than tone dialing, so it was phased out for tone dialing in the 1980s.

That's where the DialGizmo comes in. DialGizmo connects between your rotary pulse dial phone and your modern phone line or VoIP box and converts the pulse dialing codes into their equivalent DTMF tones, allowing most old rotary phones to work just like a modern phone.

The DialGizmo uses no external power and runs by drawing a tiny amount of power form the phone line while the phone is picked up.

DialGizmo even gives your nice old phone a few modern tweaks! You can dial * and #, you get 6 speed dial locations which can be programmed with any number. And you even get last number redial! All without any modifications or changes to your phone.

VoIP equipment doesn't understand rotary dialling signals

The problem which Dialgizmo solves is that rotary phones use what called pulse, or decadic dialing. Modern telephone systems and VoIP boxes don't understand pulse dialing and will usually ignore it. If you connect your old rotary phone to a VoIP line, it will ring with an incoming call, and you will be able to pick up the phone and take the call, but you won't be able to make a call because the pulse dialing is not understood.

What is Pulse Dialling?

Pulse dialing is were the phone sends a series of pulses or clicks down the line to represent the number you have dialed. On most rotary phones dialing a 1 sends one pulse, dialing a 2 sends 2 pulses, and dialing a 0 sends 10 pulses. This is how the phone exchange works out which number is being dialed. The pulses are sent by the phone at a rate of about 5 to 10 pulses per second, governed by how fast the dial returns to the start position after you dial each number.

What is Tone Dialling?

Modern phones and phone systems use tone dialing, also known as DTMF or touchtone dialing. Tone dialing is the familiar beeps we hear on the phone line which correspond to each number dialed. Again, the telephone exchange, or VoIP service listens for these tones to work out the number dialed. There are 16 different DTMF tones, but usually only 12 are used on phones. 0 to 9, * and #.

Dialgizmo Features

Dialgizmo is easy to install and use. Just connect it between your rotary phone and the phone line or VoIP box and you're ready to go.

  • Easy setup, just plug in and use
  • Supports all standard rotary phones
  • Needs no batteries, no external power supply
  • Converts 0-9 Pulse/Decadic dialing to DTMF tone dialing
  • Allows you to dial * and #, a must have for dealing with phone banking systems
  • Six speed dial locations plus last number redial feature
  • Advanced microprocessor control for accurate dialing
  • Suppresses dial pulses on the line to stop double dialing problems
  • Not polarity sensitive. Dialgizmo will automatically adjust for incorrect phone and line wiring
  • No modifications required to your old phone
  • Configurable for non-standard dial layouts (Sweden, New Zealand)
  • Does not interfere with ringer operation
  • Supports a wide range of line voltages and currents
  • Specially designed to tolerate the low line voltages on VoIP systems