Telephone Switching > VOIP, Asterisk, C*NET, NPSTN, XLink, etc

Voice over Internet Protocol (VoiP) phone service and pulse dialing

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Short Answer is yes it works with the right bits.  Both can be made to work in a power outage but depending on the outage one or the other or both could be working or not in an emergency.  POTS will work with a no external power required phone as long as the exchange and lines are working.  The techie solutions will run for a short time 24 hours or less before you for need to fire up the generator.

Long technical answer from a former Microsoftie who left the tech world and started a BBQ restaurant 7 years ago.

Comcast does not "officially" support rotary/pulse dialing.  The Comcast Arris TM502G VOIP Router works perfectly with a WE500 and has a built in backup battery.  But if Comcast brings a different black box that does not support pulse you have no right to complain.

Vonage.  Much cheaper than Comcast US, Canada and parts of  Europe are unlimited.  Last time I checked a few years ago Australia was under 4 cents.  Linksys routers had issues including no rotary support.  The new V-Portal VDV21-VD rocks.  The priority routing has been solved for dummies by putting the Vonage V-Portal between the Internet modem and your computer or router.  This means it get first priority for calling.  This could be solved on the Linksys by a techie but caused lots of customer satisfaction issues.  What the V-Portal also does is support rotary dialing  :)  Works perfectly with a WE500.  It also shows the number you are dialing and call logs including missed calls and stuff like the weather.  For power outages you will need to buy an UPS aka Uninterpretable Power Supply and plug the internet modem and V-Portal into the UPS. For the tech ignorant that is not a small light surge protect it's bigger and heavier and when you unplug it from the wall the devices plugged into it keep working.

The V-Portal arrived yesterday and the Comcast months ago at the restaurant.  So this is a real first hand eyewitness account tested with 1950's vintage WE 500's.



PS makes sure if bargain hunting on eBay the V-Portal seller has paid their bill and release the MAC address from their account.  I had an honest seller who did that after I got it.  But if they do not pay off their bill and release it you got nada.

Good info to have, thanks!

It may be a little known fact, that most VoiP phone modems do not support pulse dialing (rotary). This is something you must keep in mind if you own, or intend to purchase a rotary telephone. Or, if you intend to switch service from your copper wire (POTS) to VoiP. Since many offer VoiP now, and Comcast has recently stolen the No. #3 position for telephone service. This is going to become a well known fact as time goes on. Of course for 99% of the population, they could care less. But for us die-hard phone fanatics, it's going to hurt!

There are of course several long term solutions. A DTMF pulse converter is one. Many vender's sell these ready to plug in. Another option is purchasing an old PBX system. The different types are to numerous to mention. But a simple search of Ebay will show you what's available. Last, some VoiP modems support pulse dialing. They have a built in DTMF converter. Again, listing which modems have this feature is impossible for me to determine. I use Vonage, and their phone modem MOTOROLA model #VT2142-VD does exactly this.

One issue you may run into with a phone modem that supports pulse dialing is the actual speed at which your telephone is dialing, or "pulsing" per second. The industry standard is 10 pulses per second, plus/minus 2. With my modem, it's critical. Mine seems to only work at 12 pulses per second or better. Which means I must speed up my dials. Also, if I speed them up too fast, it causes my modern cordless phones to ring during dialing. Why? Because the speed is getting close to the magic 20/hz ring frequency. I assume my modern sets are probably "broad" in their ability to recognize multiple frequencies, as I'm not turning my dial speeds up to 20 pulses per second. So, it's a balancing game at best.

These are things we as collectors must consider, if it's important for your phone to dial out. Last, phone modems generally don't supply as high a voltage for ringing. While it's close, it's enough that a phone buff like myself might see a difference. Such as uneven clapper operation. Simply take a voltage reading across your ringer circuits when the phone is ringing to see what it is. 90vac is the norm.

If you have questions, or any further info. Email or PM me. I'll add it, or try and answer your question as best I can.

if you're running your own asterisk server or using a bring your own device (BYOD) voip provider (eg callwithus, vitelity, .. there are tons of them) you have a few more options and more flexibility in that you can connect several ATAs (phone modems as you call them) at the same time and if you're running your own asterisk box call between them.   specifically the digium iaxy and the ag-188n support pulse dialing and i've used both with WE 202's and AE 40's w/ no issues.  the former supports only the IAX protocol meaning that you're limited to connecting to mostly asterisk servers.  the ag-188n supports SIP which means pretty much anyone.

Dennis Markham:
Reuteler, welcome to the forum.

Thank you for this posting, although admittedly I didn't understand much of it. :-[


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