It is unlikely the T-Mobile is blocking at the network level so it wouldbe related to the router itself. The Envisalink uses UDP port 4021 forcommunication so the router is blocking that port, possibly over UDPonly. This may be in effort to block VPN usage or possible Bittorrentservices as both use UDP on non-standard ports. This is the response from my alarm server module manufacture.. I have had t moible for 3 months at 2 seperate properties with 2 different gateways..and everthing was working fine up until a week ago.. they must of done a update and now I cannot communicate with either alarm module
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