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Sammy00 Posted:
Has anyone setup a
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James44 Posted:
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James44 Posted:
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jjatsk Posted:
We are renting a
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On Jul 09, 2016 at 12:00:54

Pman Posted:
Hello, While
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jbugz67 Posted:
We recently
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On Apr 15, 2016 at 14:58:07

RichardPi Posted:
Hello, does
anybody recollect
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On Mar 31, 2016 at 02:39:07

RichardPi Posted:
Hello, does
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On Mar 30, 2016 at 18:48:05

achow26 Posted:
BrettaMan, I am
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alicesmith Posted:
I have used the
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cellist
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PostPosted: Fri Sep 19, 2008 2:22 pm    Post subject: Internal dial-up modem Reply with quote Back to top

[font=Arial] [/font] I'm using the Vonage VT2142 device. Can I route the 2142 into a 56k internal modem, in order to take advantage of some software that I used to use with the internal modem?

I found a forum thread that discusses this issue but it does not come to any definite conclusion.

TIA,

Phil
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DLevenson
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PostPosted: Fri Sep 19, 2008 6:49 pm    Post subject: Reply with quote Back to top

I think you are asking about connecting the telephone line port of your modem to the telephone line port provided by the Vonage device, so that you can place data calls via the Vonage network. I do this routinely, but I'm using 1200bps and 2400bps modems. They work, but the error rate is a little higher than it was when the modems were connected to POTS service from the local telco. I'm willing to settle for a higher error rate (e.g. a lower data transfer rate, due to occasional re-transmissions) in return for a lower cost for the calls.

I also routinely send fax data at 9600bps over Vonage, but I'm not sure that is directly comparable. It is possible that the Vonage device is spoofing the receiving fax machine while translating the fax data into a fax-over-IP protocol of some kind to traverse the Vonage network.

I've never tried it with a 56kbps modem. It might work, but it might work at less than 56kbps. When I asked Vonage customer service this question (several years ago) I was told that Vonage only supports voice service (even though they were promoting fax lines at the time).

Perhaps someone has tried and can give us a more definitive report?

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VonTechMgr
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PostPosted: Fri Sep 19, 2008 7:47 pm    Post subject: Reply with quote Back to top

Here it is to sum this up. When sending data from analog to digital, the Voip adapter must take the data tones and break them down into IP packets. The faster the machine attempts to stream the data tones, the harder it is for the adapter to buffer and convert to IP. Therefore some data may be lost. These packets then have to traverse many hops on the internet to get to Vonage before they terminate to TDM on a gateway. There may be even more packets lost while on the internet. If the same thing happens to voice, it is acceptable because the human brain can listen to a sentence even though there might be symbols missing yet still understand what was said. A Data modem cannot understand missing information.

Once Vonage has terminated to the PSTN network, one of their carriers may even transport via IP which also may be compressed(most LEC's do because it's cheaper) which may even cause more packet loss. By the time your data reaches the far end modem, there could be chunks of data missing which causes a transmission error. This is what makes using Tivo, Direct TV, Alarms, faxing, and anything that is analog data somewhat difficult over any Voip connection.

For faxing, the T38 protocol is used providing the Voip adapter you have supports T38. All the newer ones do. The legacy Linksys Sipura based and Cisco ATA-186 do not. T38 will only be invoked during the preamble heard usually only on fax machine handshake. T38 sends images through RTP and can retransmit. Standard codecs such as g729, g726, g711 used for voice and data do not. With that said, I am not sure your data connection would force the call to renegotiate to T38 since it may not have the same type of fax preamble.

The only way to use a data modem with a Voip connection is to keep the baud rate as slow as possible. 9600 is usually the fastest but depending upon conditions, you may have to reduce and test for yourself. You also need to make sure you are using a new RJ-11 cable that is seated well in the FXS port of the adapter and in the fax machine. This will prevent any additional line noise from interfering with the connection. Lastly do not run the RJ-11 cable over or near a power source if possible as this causes line noise as well.
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cellist
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PostPosted: Fri Sep 19, 2008 9:47 pm    Post subject: Reply with quote Back to top

Thanks to both VonTechMgr and DLevenson for your replies. You provided a lot of useful information.

I've connected the Vonage device to the internal 56k modem, making no changes to the modem setup. It is using the same settings as when I was making calls over a landline. I've made a couple calls from and a couple calls to the system. All the calls seemed very clear from both sides. My wife was the caller and the receiver using the Vonage phone, while I was at the other end on the cell phone.

I realize this hardly proves that "it works". Is there a utility that will measure the error rate? Or will it become clear, over time, whether calls are suffering from excessive errors?

BTW, I don't plan to use the Fax capability at all. My primary purpose for using the dialup modem is to experiment with enhanced reporting capabilities that the Vonage software does not offer, but that may be available using a software application that can deal with the dialup modem. (Will Vonage ever provide an API to their device, or even to their log file?)

For example, I'd like to popup the caller ID information on the PC. And when no caller ID is available, but the caller's number is listed in my phonebook, I'd like to substitue my phone book info for the missing caller ID. I'd like to insert my own software answering machine into the process, so that the when the caller start his voicemail with, like, "hey, it's Joe, pickup if you can", I'll be able to hear that real time and pick up the call. And I have a couple other ideas that are probably silly and that I'm a bit embarrassed to reveal to the general public Embarassed

I don't know for certain that any of these features will become available using the dialup modem, even if the setup is "working" in other respects. If the dialup modem setup does not provide high quality voice transmission, then it doesn't matter whether these other features work or not.

Thanks for you help,
Phil
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VonTechMgr
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PostPosted: Fri Sep 19, 2008 11:44 pm    Post subject: Reply with quote Back to top

For the uses you are planing for the modem, there should be no issue. ANI is passed between rings which is industry standard for all CID. When the ring volatge drops, the CID will be displayed. Therefore if you use 3rd party software such as Ring Central, you should have no issue getting caller ID to display on your PC.
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