Same problem here. I use two DID providers, one requires registration, the other forwards to a fixed SIP address. The second one works fine, the first one (requiring registrationg) does not (busy signal).
I tried unregistering from the first DID provider in Voxalot, but despite setting "SIP Register" to no, it still shows as "Registered" - strange. Setting "SIP Register" back to yes doesn't change anything. and I still don't receive calls 8-(((
Martin
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