Forum Discussion
Intermittent Incoming Calls Going Straight to Voicemail with No Ring
I have several issues with T-Mobile’s network: On occasion incoming phone calls go straight to voicemail without my phone ringing, showing a missed call notification, etc. If someone leaves a vo...
Issues like this are mainly need Solución de problemas de señal to get this resolved. I'd start there first and follow those common steps to fix this.
In most cases, the issue is two-fold. On the land-line side of the T-Mobile system, there is a part of the call switching system called Signaling System 7. (SS7) This system has a signal called "Connection Confirm." This signal makes the calling phone system wait until your phone has been located on the network, then creates the ring signal for both ends. This also starts the timer for the call to go to VM.
If there is a problem with this signaling system, it can cause the timer to forward calls to your VM prematurely. Keep in mind the call forwarding happens on the land-line side of the system, before it even goes to the towers.
Where your device’s connection comes into play, is a weak signal to your device, or heavy network congestion can make it take too long for the system to find your phone before the call forwarding times out, sending the call to your VM.
I am currently having this issue in an area with an amazingly strong signal. It even happens while I'm on the phone. The call waiting does not show a second call, but I get a pop-up to tell me I have a new voicemail. Sometimes, it shows one or two rings, but the call is gone before I can answer it. A minute later I get the new VM pop-up.
The fix must come from T-Mobile's engineering team. So far, no one I talk to understands that side of the system.
