this post was submitted on 28 Nov 2023
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Is it a 4G only issue? Does the Telstra phone work over WiFi?
Yes sorry I should have specified. Telstra is on 4g. Works using Telstra broadband, just not 4g. Could it be a NAT issue?
My thought is NAT issue, though I'd have thought Sangoma Talk would use a STUN server to handle that.
The fact the phone keeps sending the REGISTER over and over, suggests it's not receiving the 401 response. I'd start by double checking the Telstra 4G IP address,
then making sure the REGISTER has the correct IP in the Contact header.
I'm not sure what logging you've setup on the phone, but are you able to see the 401 arrive on the phone?