I was able to get this working. I think your issue is that you are registering with sipgate instead of sipsorcery on your phone. You need to connect to sipsorcery and let the dialplan connect to sipgate.
Maybe I have it. Stupid me would use the + from the stock dialer and then it would just ring and ring...didn't realize that's going thru GV and I needed to hang up and it rings me. Convenient enough, dial with the + directly or set that number in my contacts list, ring once, hang up and then I get the free incoming relayed call. Seems like I can also just dial directly from sipdroid.
My question now is: what's the easiest way to dial this for free directly? The + option is fine, but I'd rather not have to hang-up and wait for the GV call back, and I'd rather not use sipdroid directly. Are those my only two options, or is there a simpler/easier interface? I think the only way to get free is to do the call back with GV - no way to route thru GV without dialing it and ringing you back?