Based on the last time I checked, Callcentric does not register in Voxalot.
It simply behaves as though it was forwarded even when set to register in the provider set-up.
Not sure how the Callcentric Voicemail would behave when set to register. I'll try to test over the week-end.
Calling the Voicemail (dialing *123) using Callcentric as the provider should work, but you would have to set up a Dial plan entry to handle that.
The Callcentric MWI will not carry to Voxalot as far as I understand how Voxalot works. The MWI message is only valid for Voxalot voicemail.
Not sure about the last question, but I do use Voxalot with ‘symmetric NAT handling' set to off.
Various people have had issues with multiple SIP devices registerd to the same Voxalot account. My experience is that it can work reliably for 1 or 2 SIP devices running behind the same firewall. For more than 2 devices or devices running on different IPs, the voicepath may not be established reliably, though the devices do in fact register.
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