TPG Engineer contacted me and told me that they won't look into this issue because they are convinced it is due to the third party softphone app.   Doesn't matter how many times I tell them that it works fine with other ISP's.   I have had to contact my softphone provider to setup twinning on my softphone and personal mobile so that at least I can work using my personal mobile phone to receive calls, I still can't call out from my work extension. (Not a solution, but a viable workaround for me at least)   Summary of troubleshooting on my end: Tested with Optus Cellular - Working Tested with Vodafone Cellular - Working Tested with Optus NBN HCF 50/20 plan - Working TPG Home NBN HCF 50/20 - NOT working Swapped modems with TPG internet connected - Still not working Used Vodafone SIM card in 4G modem and it is working Disabled SIP ALG on Router Firewall - Still not working Tested on Dell Laptop and Microsoft Surface - both not working with TPG connected Changed local subnet to match work subnet to rule out NAT issues - Still not working Hope this helps someone from TPG if they have another chance to look into it.   ... View more

Hi @Ahra_G and @Shane    The Work IP Softphone does not require a static IP and works fine with Dynamic IPs. I have tested the softphone with the following environments: Optus NBN Dynamic IP Vodafone cellular hotspot Optus cellular hotspot And these all work fine.   It is just my TPG NBN home environment that is not working.   I spoke with one of my colleagues who had a similar problem with Aussie Broadband NBN and they said that the ISP was blocking non-standard ports. It started working after Aussie Broadband allowed this through.   Regards, Nathanael ... View more

Exact same thing with me, if I tether to Optus or Vodafone SIM then it works fine.   VPN is Forticlient and softphone is Mitel Connect.   I have also tried with multiple routers.   I can call out and receive calls, other side can hear me but i don't hear anything. ... View more

Hi,   Was there a resolution to this?   I am having the exact same issue with my new NBN connection ... View more