When calling between Voxalot phones I use the name of a regional proxy in the SIP address; 123456@us.voxalot.com. If I try to make the call as 123456@voxalot.com the following error message is returned (in a SIP packet) from Voxalot.
SIP/2.0 403 Forbidden. Use (us, eu or au).voxalot.com
Note that 123456@voxalot.com does work (and may be the preferred form) when calling from non-Voxalot phones.
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