An other update.
When I signed up with numbergroup, I did so with my Voxalot SIP info and had the problem for few days. I switched to callcentric as reported above and the problem disappeared. Switching back to Voxalot (after callcentric) worked fine.
At the end, groupnumber works (for now) with Voxalot. Not much of scientific approach or actual explanation, but a fact nonetheless.
I would appreciate feedback from other groupnumber users, if any.
Thanks.
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