I got my Grandstream and plugged it in behind my router, followed the other directions, and it works fine.

Now my question concerns the instructions, which say I should port forward UDP ports 5004 - 65000. This is obviously an insane direction that's meant to reduce support calls and has nothing to do with an actual requirement. So my question is how many ports the Grandstream really needs.

Left to its own devices, it settled on 5078 and 5079, probably because I had a softphone using 5060/61 already.

Does it really need more than one forwarded port per line?