I only use Voxalot callback, not any ATA methods
I just tried some calls that worked a couple of days ago, Voipcheap for both legs including a separate call forward to a mobile, and they did not work.
Using a different provider then the forward to the mobile, it rings for the first leg and on answer I hear a triple-beep cut off; no Voipcheap connection.
Oddly though, if I answer the first leg elsewhere, before the call forward to the mobile, I then get a successful VC call to the destination.
So it's rather odd, and the problems aren't uniform, so might not be deliberate
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