Are you data roaming? If so, it might be that I have the same problem.

Model : MR6400 Hardware Version : MR6400 v1 00000000 Firmware Version : 1.0.12 Build 160906 Rel.51894n ISP : Hello, I'm UK based. My MR6400 works perfectly on UK sims (EE and 3) but does not connect...

Thank you for the reply Ada. I'd since discovered that you cannot ssh to the 8616 so maybe the tool you provided is the only way to disable SIP ALG. Fortunately for me, the problem corrected itself....

Model : Hardware Version : Not Clear Firmware Version : ISP : I've just purchased a TD-8616 to replace a Netgear modem. I run it bridged behind a Netgear router. The 8616 configured easily and I was...