Medtronic Carelink Monitor

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giqcass:
The machine creates a digital file.
The file is turned into an analog sound.
The OBi is turning that sound into digital which is being transmitted via the internet.
The phone company is converting the sound back to analog at the other end.
The receiving computer is converting the analog sound to a digital file it can read.  
Similar to a Modem (modulator - demodulator).  

If the call is being connected at all the adjusting then baud rate as low as it goes and adjusting the codec to the least lossy possible should help.  I would be curious to know if the logs show the call is being connected and how long the call is.

If all else fails you could also try a traditional VOIP provider (something other then Google Voice) for these calls.  Many allow prepaid accounts which are very inexpensive.

The following are recommended for faxing with typical VOIP.  
G711U
9600 baud
Silence suppression off.

Just to clear something up here.  Sound is always analog so if you can hear the data it is being converted to analog. http://wiki.answers.com/Q/Is_Sound_digital_or_analog

Shale:
If you plug a regular phone into the Line of the Obi100, can you make calls?

If you dial the phone number of that the gadget calls, do you get a ringing signal followed by some kind of tones? Make sure that you don't get some kind of error message.

MikeHObi:
An interesting example here.  Cisco AS5300 universal access server gateways support modem access, and have this note:
Quote

When the gateway detects a data modem, both the originating gateway and the terminating gateway roll over to G.711. The roll over to G.711 disables the high-pass filter, disables echo cancellation, and disables VAD. At the end of the modem call, the voice ports revert to the prior configuration and the digital signal processor (DSP) goes back to the state before switchover. You can configure the codec by selecting the g711alaw or g711ulaw option of the codec command.



Indicating that most voice configurations are non-optimal for data packet usage.  (Note that VAD is voice activity detection).

Diana:
If you only do this once every three months, could you use a neighbor's/friend's (even the school he attends) landline to transmit the signal?  Apart from the landline/cellular option, does Carelink offer the ability to download the information from the Device to your PC and send the file as an attachment via an email?

Is there a way to transmit at a lower baud rate or change other transmit parameters on the Monitor?  Maybe with the right data settings you could get this to work with your OBI/GV combination.  As mentioned before, a VOIP provider like Callcentric might be a better choice using their T.38 Fax protocol and they might help you troubleshoot the issue.  Why not shoot them an email and explain your problem and see if they can offer a solution.  They offer a free incoming DID from NY state and you could fund the account for outgoing calls.

Quote from: peter0109 on February 11, 2013, 04:59:43 am

Yes, it is a routine data send for doctors to monitor without an actual visit. I have called Carelink and was familiar with the cellular option, but they charge a monthly fee of around $12 I believe. I was trying to avoid that for something I transmit once every three months.

So there isn't a device that can change the medtronic analog signal to digital?

It does connect the call and it sounds like it is sending, making the loud faxing noise but I don't know if the other side is hanging up or just not understanding.

What should I change the DTMF settings to?

Thank you!

n0uwy:
  I do not know if anyone has answered the question or if this will help or not.  Today was the first time I attempted to use my Medtronic Carelink Monitor to send data over Obi to the doctor's office. I tried six times. 
      The monitor would dial and the doctor's office machine would answer.  The tones were sent but no connection was made. After about one minute the doctor's office machine would hang up.
       I went next door and used their phone to send the data. 
       Then I did a search on the Internet.
        Someone said to use G711 format.
        I see that in the list of Obi Start Code commands that you can enter "*4711 and it will use G711 for the next call. 
        Has anyone tried that command to see if it will work.
        I only send data each three months.  So I will try it in three months.

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