@KoenVG If Your router does have nat boost and airtime fairness functionality, then try to disable them.

@rmadoo Try this - Archer C80 guide to show and disable hidden SIP ALG option.

@Vedia As help say's - "Please start with http:// or https:// and no blank space" so first I used http://127.0.0.1 and acs user/pwd tplink, but seems that user/pwd is not needed and simple "http" is...

Hi, Archer C80 > search > SIP Clicking the result opens menu: But where is SIP ALG? It's actually there, but hidden in code. Use Chrome, developer mode > advanced > alg and paste into console window:...

@ChintanB In my case it does not help. Last day's I made some tests: advanced > security > firewall > spi > no effect, back to enable advanced > network > internet > nat boost > disable - possible...

Since yesterday, I made some tests: advanced > security > firewall > spi > no effect, back to enable advanced > network > internet > nat boost > disable - possible reason? advanced > wireless >...