Disabling SIP/ALG on my new Tmobile Home Internet - FAST5688W

I am experiencing same exact problem.  I have spent DAYS on HOLD with every conceivable party and all I am getting is the RUNAROUND.  T-Mobile has NO SUPPORT.  Certainly none interested in solving problems.

I also am trying to get my work IP phone to work with my T-Mobile Home Internet.  I cannot make calls or receive calls.  I was told that I need to disable SIP/ALG on the router.  I am using the Arcadyan KVD21 router from T-Mobile.  Has anyone gotten this resolved yet with T-Mobile?  I may have to cancel my service and go back to Comcast.

The only way around this is to buy a Modem/Router that supports the sim card from the homewifi network of t-mobile. There are a few out there but they cost about 600.00. There's also youtube videos on how to use this. But quite frankly at that point since your line costs you 35.00 a month anyways for a new phone line. You might as well just buy a 299.99 router modem that will work with T-mobiles bandwidths , then you don't have SIP/ALG service and although you are limited to 100mbps about. You can still use your VOIP phone which is necessary now for a majority of remote working.  Eventually T-mobile will get a clue and change their device firmware settings to update their devices to turn off the SIP ALG firewall settings that are embedded in the coding. But until then. They will be losing customers non-stop due to the growing number one use of home internet, VOIP for business. Kinda a moronic thing for them to do , to block SIP on the Appllication Layer Gateway in their firewall when its needed to make outbound calls. Ports 5060 and 5061 are basically blocked which are the calling ports for these systems used by companies globally.  Friend had their t-mobile homewifi for business version and it was the same thing so he returned it within 4 days.