I believe the thread QBZappy pointed you toward is for configuring a PC-based softphone like X-Lite to work with the Obihai middle-ware client that has the information you're looking for hard-coded into it. That thread wasn't for a smartphone-based SIP client.
I don't believe the information you're looking for has ever been disclosed by Obihai.
Ok - I kind of see that now.
I would sure like to get this working! Either this Bria or the OBiON, but the features of the Bria look stronger. Frankly.
But thank you anyway.