I picked up a Chateau LTE12 which arrived with RouterOS v7.0beta6 factory installed. For initial testing no changes were made to the default configuration other than to set passwords for the admin user and WiFi access.
With v7.0beta6, I had a basic VoIP system physically connected to ether5 which successfully registered with it's service provider and was able to make and receive calls.
Upgraded to the latest (RouterOS v7.0beta8) and the VoIP system failed to register with it's service provider, downgraded to RouterOS v7.0beta7 with the same results.
I have submitted a support request to have RouterOS v7.0beta6 as this version does not appear to be available for download. In the interim, I have downgraded to RouterOS v7.0beta5 and VoIP is able to register with it's service provider, make and receive calls again. I was only able to downgrade RouterOS, Routerboard would not downgrade, presummably because beta5 is a lower version than the factory installed beta6.
The VoIP system is a Gigaset SL450A (with Go-Box 100), VoIP service provider is Sipgate, net access is via the Chateau's LTE interface with no public IP address on my side.
Other than to say "Works with this version but not with that version", is there anything else I can do at my end to provide Mikrotik with more detail to resolve this issue (enable extneded logging or debug options etc,.)?