@Kevin_Z Yes that email does look familiar. 'They' do not seem to have a clear idea about my problem. Moreover they say that if I don't hang up on phone1, I should be able to continue the call on...

@Kevin_Z I do not recall receiving anything useful by email since I told you that the options YOU can access are not available to me. I'm also unclear as to what you are trying to achieve. There has...

@Sunshine Sad to say, I can not reach the option you suggest tweaking. For you it occurred under TELEPHONY - I do not have that category in the left pane.

'It would improve the quality of the phone connection.' I had no complaint about phone quality, so that was a red herring. IT did NOT solve the problems I posted about. I have discovered that if I...

When I tried it later, I could follow your steps - so there is an unreliability - and I enabled SIP ALG. Please tell me what change I should expect.

I'm in Ultimo, Sydney, NSW, Australia. My ISP is TPG. I had not tried your suggestion because I did not know about it, but when I entered https://tplinkmodem.net into Chrome's address bar, I got...