Medtronic Carelink Monitor
RFord:
First off. Are you using GV or other VOIP Provider? Which OBi ATA do you have?
I do not use the Medtronic Carelink Monitor, but a couple of things you can try in the future is:
1. Set DTMF to Inband [ Service Providers >> ITSP Profile A >> General >> DTMFMethod >> InBand ]
2. Slow the Baud Rate of the Unit to about 9600 or less
3. Turnoff/disable/enable any Error Correcting Mode (ECM) if available on the machine.
Quote from: n0uwy on July 15, 2013, 09:04:39 pm
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.
SteveInWA:
How many techies does it take to screw in a lightbulb? Or, in this case, send pacemaker data?
DTMF has nothing to do with this. DTMF (aka "TouchTone") is only used for human interactions with IVRs or other systems that ask you to press a dialpad key. Data modems (such as the one in the Medtronic device) have their own set of digital<-->analog modulation (CODEC) methods, totally unrelated to DTMF.
Google Voice already uses the G.711 PCM VoIP CODEC. It's the only CODEC supported by GV. There is no setting needed for this.
The real issue was already pointed out by MikeHObi: the typical ATA has too many functions and settings, designed to optimize human voice conversations, interfering with the ability to reliably send modem data over a VoIP connection. Furthermore, GV's VoIP routes are not very consistent nor reliable. It's likely that the only VoIP provider that would work with a modem would be one such as Comcast, whereby the VoIP provider uses managed IP routes on Tier I networks, to minimize jitter, packet loss or latency.
Short answer: use a POTS land line, or next best thing, a VoIP service provided directly by a fiber optic internet (FiOS) or cable company, on their own managed network.
Shale:
When you call somebody, is the volume of the audio at the other end soft or loud? For me it was soft. Therefore, using OBiTalk "Expert Configuration", I would try
Configuration
Physical Interfaces
Phone 1->ChannelRxGain = 12 (or 6 or 3 dB)
That would increase the volume of the modem tones being sent. Seems worth a try.
SteveInWA:
Modems have automatic gain control (AGC). Adjusting the gain on the OBi is certainly harmless, but cranking it up will likely only add more distortion to the signal. You'd also have to fiddle with both the Tx and Rx gain, "flying blind", because you wouldn't know which side of the "conversation" between the modems is having problems.
Sometimes, the best solution to a problem is not a technical one, but a practical one...that's why I mentioned just giving in, and using a more reliable connection via POTS or managed IP.
idenphones:
I have the same Medtronic unit in the bedroom. Medtronic told me that it would not work with VOIP and I absolutely had to have an analog phone line. Can't get it here and McDonalds won't let me use their line!
My first setup was with Vonage.................FAIL........Fail.............FAIL...........Did I mention Fail?
Magic Jack......................NOT!
Third was with a Cisco SPA 122 and Voip.ms...............PASS! Setup was easy
Currently working on setting up a OBIHAI 202 with Voip.ms and it will work too. Testing it right now.
You need to use the higher bandwidth codec G711U. I have a separate line and number for the Medtronics box. I use it like a fax line but without T.38 just fixed on G711U.
I am also using a mobile Internet connection with Bell Mobility and a very junky Netgear MBR1516 4G Turbo (they claim) hub.
For your information..................This is what I have seen with my units.
If you hold the antenna over your pacemaker/icd and push the button on the box, it will download the info from your device and call into the Medtronic office to verify that all is well.
When the device downloads by itself, it forces the Medtronics box to call another number to downlod the info to.
If all is well, the test call lasts about 3 minutes. A for real download last about 90 seconds.
At least that is the way mine seems to work. The doctor and Medtronic are happy with the downloads.
PLEASE VERIFY ALL OF WHAT I HAVE SUGGESTED BEFORE YOU TRUST IT!!!!!!!!
Everybody has been very secretive about what the Medtronic box does so I had to monitor the data and phone lines to figure it all out.
No magic. Just basic electronics.
Forget Google Voice and all the other free or almost free services.
Checkout the commercial services. Even with their premium services your charges will be very cheap and they will be reliable.
You need to keep that Timex Ticking properly!!
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