We are installing a Cisco UC520 system at a site that has had analog phone lines till now.
As per my understanding, a SIP Gateway would be the best way and more cost effect way compared to analogue Verizon lines.
I am looking for some really good quality SIP Gateway providers that are reliable as well.
I don't think the big telecoms(verizon and ATT) offer such SiP gateway services.
I have heard bad stories such as poor voice quality and service outage for some of the relay cheap ones.
Also, we would be using a Comcast cable modem line (25MB down/ 12 MB UP) at this site which is also shared with the computers.