However in my case this is for use with an existing home PABX and an ATA. As far as I can see Sipgate offers the ability to have multiple (presumably simultaneous) connections even without a SIP trunk although this does seem to be an extra cost.
In terms of actual use I have no real need for multiple simultaneous lines but as I have a Grandstream HT802 which has two connections and my PABX supports multiple lines I am interested in at least understanding how this could be done and which VoIP provider might be best for this.
Are there any free VoIP providers which would allow multiple simultaneous connections using a single account and single phone number? If not free would Sipgate be the best paid option?