My friend asked me to try to configure a IP PBX system for his small office (3 to 5 employees). I just finished configuring my first Asterisk PBX system this week and purchased a low cost SIP trunk with 1 DID for testing purposes. The installation is done on a laptop using Virtual Box for now. At this point I am ready to move ahead and get something more real world like.
My friend has 2 POTS phone lines and we would like to keep them, as his location does not offer SIP trunks. I was wondering what would be a good low end IP PBX system to purchase. Should I purchase a VoIP gateway for use with a small PC or should I purchase a PCI/PCIe card for a small PC? What really worries me is the echo cancelation, how much of an issue is this usually and are VoIP gateways good at handling this?