1) You do not need to flash mini to upgrade to SP1. Just flash it with standard or whatever and be sure to reset your settings to the defaults afterwards.
2) The VOIP version will work on the WRT54GL.
3) You do not need th VOIP version for Vonage. Just use the standard version and setup QoS. _________________ WRT54G v2.0 (Bridge)
WRT54GL v1.0 (Bridge) (x3)
WRT54GS v3.0 (Routing)
WL520gU (Routing)
Running DD-WRT v24 SP2 - http://www.dd-wrt.com
I think you're referring to the special step for routers running the original Linksys Firmware that are to be upgraded to the dd-wrt firmware.
In the original to dd-wrt case, the mini distribution must be used, due to the 3 MB limit the original linksys firmware set on the firmware to be uploaded.
Once dd-wrt is loaded and running on the router, you can use any dd-wrt size distribution, standard or VPN.