HT-502 vs RT31P2 and distinctive ring?

Anyone use distinctive ring with the Grandstream HT-502. If so, can you try the following:

* Set distinctive ring to use Ring Tone 2 for a number (say your cell number). You do this from the vPanel -> Beta -> Distinctive ring.
* Call your VOIPo number from the number you've set for distinctive ring. Your VOIPo phone should now "ring ring" pause "ring ring" pause, etc.

For the Grandstream, I hear a regular ring as the very first one and then subsequent rings are distinctive. If I use an RT31P2 even the very first ring is distinctive. I'm curious about what others with the Grandstream experience. Anyone have a Grandstream which behaves like my RT31P2? I'm curious what other with the Grandstream experience and I'd love to know if you have a Grandstream which behaves like my RT31P2 (distinctive ring wise).