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VOIP SIP Softphones cannot connect on 5T Aug 8, 2019

SeanDevoy , Aug 8, 2019 :

VOIP/SIP Softphone software will not work on a One+ 5T. I have tried a few including Bria Mobile and Zoiper. Those both work on the same WIFI with the same account using other devices.

I have done a packet capture at the server. The One+ 5T sends an auth packet, which is refused (by design) and the refusal packet includes a NONCE for a re-auth. That failure packet is not processed by the softphone, so no re-auth is sent. The softphone applications report this as a TIMEOUT.

This problem is specific to my 5T. I have tried this same software on a Samsung Tablet and Samsung Galaxy Note5 on the same WIFI and it works fine.

Every time I have seen this problem on other VOIP devices it has been a NAT translation issue.

I reported this to One+ on chat and they asked me to document it here.

Does anyone know of a SIP SoftPhone that works ON a ONE+ 5T (not other models).

Thanks,
Sean