Analog phone ports seem to have fallen out of favour. But I have a Grandstream controller sitting on top of my Omada stack and I would like it very much if there was a firmware for Grandstream that spoke to SDN. 

The reason for specifying Grandstream has to do with the desirable characteristics dealing with call quality and buffering out jitter. Variable jitter is a feature of all satellite based connections. The specific engineering ability of Grandstream is to retain call quality over variations in data rate. 

Sometimes I think there must be a way to make the two brands speak to each other. Obviously that is a wishlist item.