In the past, I have used Grandstream and Yeastar IP systems for analog lines and extensions.... Still do. However, for the price of a single analog line, I can give a customer 5 or 10 VoIP ports. Grandstream has an 8 FXO/FXS port system UCM6308, or 6304 or 6302 that have 8,4, or 2 sets of ports, but their VoIP phones sell at price points similar to those digital phones on PBX's. Or, skip the wires and use WiFi as in a Grandstream GRP2615 or 16 and all you need is an electrical outlet.
I wonder, has Mitel exited the digital system market yet? A Mivoice office 250 and 5300 series phones might work in a small office. And, A SEARCH ENGINE LIKE DUCK DUCK GO works better than (hack,spit) Google for actually getting results of what you ask for in digital PBX systems.
Carl
