Until last Tuesday (8.3.22) I could connect to sip.2talk.co.nz. Since then it has stopped.
Simple functional test >telnet sip.2talk.co.nz 5060< will no longer connect, however it works on my mobile on Swisscom. Provider in Switzerland are not affected for ex. SIPcall.CH (sip.bacbone.ch) still works.
Here the telent session:
C:\Users\JayPieren>telnet sip.2talk.co.nz 5060
Connecting To sip.2talk.co.nz…Could not open connection to the host, on port 5060: Connect failed
Using a VPN within Switzerland also works. (addtional; info telent sip.backbone.ch 5060 work without a hitch).
Seems UPC is blocking the international port 5060