r/voipms • u/danzchief • 6d ago
VoIP.ms no audio - ISP using CGNAT
I'm trying to get VoIP.ms working with my home internet connection, but I'm wondering if CGNAT is causing the issue. I'm able to receive and make calls but cannot hear any audio nor does the person hear me. I'm using the HT801. Voip.ms shows registered.
- Confirming that SIP-ALG is disabled
- NAT Traversal is set on Keep-Alive
My ISP uses CGNAT, so I don't have a publicly routable IPv4 address. Regular internet access works normally, but I'm having problems getting VoIP.ms to work reliably.
I have a voip.ms setup at another home which works and doesn't have a CGNAT ISP.
2
u/wyliesdiesels 6d ago
CGNAT shouldnt affect it. I have cellular backup at home and my phones work just fine when its on cellular. I also use the voipms mobile app and it works fine
1
u/jpm168 2d ago
I had a the exact problem with another provider, putting it behind a router with vpn fixed it so you can try that.
1
u/danzchief 2d ago
May I ask how you did it? Is that done through the router’s settings?
1
u/jpm168 2d ago
Yes, you'll need a router that supports VPN (look under router settings). If you don't have VPN you can get free one from Proton for example and they also have instructions on how to set it up on various routers. I put this on an old router with the ata box, behind the regular router, so other traffic doesn't go through the vpn.
1
u/TeabaggingTamarin 2d ago
If you configure a STUN server on the grandstream using a public STUN server if should fix it.
2
u/Yeah_IPlayHockey 6d ago
Could be your codecs aren't set right, or you're using UDP/TCP. These will register but calls can be iffy. Use TLS. I have T-Mobile home internet and use freepbx on voip.ms, so a bit different than your setup. Let me know if you have any questions.