Leica P2P RTK with AT&T GSM Modem

John,

You are not going to like my answer.

AT&T will not allow access to a static ip which is on their network, to be accessed by a dynamic or static ip which is also on their own network.

T-Mobile is essentially (or usually) actually just a reseller...and to me appears to be a part of the AT&T network.

Your easiest solution is to get a Verizon MyFi to leave at the base with a static IP, or get a Verizon MyFi to carry in your pocket.

Or get Verizon at both ends.

The proper name for what AT&T is doing (or not doing) is called "provisioning".

I have a Bridge-X with a T-Mobile static IP, I can hit that from my rover with a dynamic IP address also on T-Mobile. I think the issue is with AT&T and while T-Mobile and AT&T may or may not roam on each other (depends on current roaming agreements), I don't believe that T-Mobile is just a reseller of AT&T at all. I sometimes buy a SIM from AT&T if working in a fringe area, not always, BUT sometimes the AT&T data works better than the AT&T, if T-Mobile was just a reseller of AT&T I don't think that scenario would play out like it does.

SHG

We are having a similar issue with our Altus unit. I was told because it is an older unit the modem only supports 2g gsm. AT&T recently upgraded and only supports 3g and LTE in our area.

If you have the capability the MiFi is the way to go.

Shelby H. Griggs PLS, post: 356378, member: 335 wrote: I have a Bridge-X with a T-Mobile static IP, I can hit that from my rover with a dynamic IP address also on T-Mobile. I think the issue is with AT&T and while T-Mobile and AT&T may or may not roam on each other (depends on current roaming agreements), I don't believe that T-Mobile is just a reseller of AT&T at all. I sometimes buy a SIM from AT&T if working in a fringe area, not always, BUT sometimes the AT&T data works better than the AT&T, if T-Mobile was just a reseller of AT&T I don't think that scenario would play out like it does.

SHG

Shelby,

Calling T-Mobile a reseller, of AT&T is just from my experiences, but it sounds to be not the case where you live. This is likely due to the roaming agreements you mention.

I have (frustrating) experience that this issue does exist with a T-Mobile dynamic at the rover, connecting to an At&T static at the base in the Florida market. I would be interested if reversing the carriers would solve this.

John Evers, post: 356036, member: 467 wrote: John,

You are not going to like my answer.

AT&T will not allow access to a static ip which is on their network, to be accessed by a dynamic or static ip which is also on their own network.

T-Mobile is essentially (or usually) actually just a reseller...and to me appears to be a part of the AT&T network.

Your easiest solution is to get a Verizon MyFi to leave at the base with a static IP, or get a Verizon MyFi to carry in your pocket.

Or get Verizon at both ends.

The proper name for what AT&T is doing (or not doing) is called "provisioning".

John,

Well, I got it to work. It seems that both the rover and the reference need to have a static IP (APN = i2gold) if they are both on the AT&T network. It has to do with an AT&T system anomaly in which no devices on the system other than those on i2gold access point (APN) can access a static IP on i2gold. I could see the stream from my PC at work but not from my laptop when tethered to a dynamic IP AT&T phone. Shelby could access the corrections on his T-Mobile setup 200 miles away.

I would love to go the hot spot route but the GX1230 reference does not have Wi-Fi capability.

As for T-Mobile being a reseller of AT&T, I have spent years working for both providing site surveys for new T-Mobile towers & AT&T towers. Sometimes within a couple hundred feet of each other and sometimes sharing towers (but not equipment). I know in some areas they have roaming agreements to augment their system but that is about it. The FTC made sure of that.

The good news is that I am now able to avoid a bunch of radio set ups and just us the IP corrections.

John,

That is excellent news. I sure wish that more employees at AT&T were aware of the (APN = i2gold) requirement on both ends. I have had a bunch of AT&T reps state that what we wanted to do was not possible anymore.

You have found the solution that will help quit a few people.

Big Thanks!!