Hello @mimble 

got here through a search engine (only your thread popped up)

same issue on both vr2800v & vr600v. One on DE firmware, the other on EU (I'm from Italy.)

Did you ever find a solution/fix?

I also receive a lot of " Get an incoming call! " & "can not find any account forthe incoming call" in the logs before the SIP MAX shows up... 

Seems like the VOIP functionality on these tp links isn't thoroughly tested.

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Right now I can't find a decent DECT-capable "all-in-one" unit.

AVM Fritzbox = firewall / upnp issues, telephony works great

TP-Link "V" = routing side works great, telephony has issues

ASUS "VG" = untested...

Maybe I'll give up and do such a connection:

(Ex. tplink) as main modem / router <---> Fritzbox as client <---> telephony

Best regards,

F.