For the benefit of everyone:
With joint efforts (thanks to Martin from Voxalot and Lorenz from PBX-network!) we finally found the reason for this issue (affecting all proxy services, not Voxalot only):
If a PBX-network customer registers his account with a proxy service all other users of this service will be challenged for authentification (407), which of course will fail.
PBX-network will workaround this issue in the next few weeks. Will keep you updated.
Regards,
gambrinus
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