Voice routing devices?

[olegmz]

I am not sure if this is a right section, but at least is the most relevant.
So my question is which consumer grade VOIP gateway device supports basic PBX functions and allows routing (choosing) between internal FXS ports and outgoing SIP connections.
I have PAP2T-NA which allows to setup 2 different VOIP accounts and connect 2 phones. However all I can do is to call from Phone 1 to Line 1 or to call from Phone 2 to Line 2.
What I need is an ability to choose which line (VOIP account) to use from the same phone (by using dialing plans or using different starting digits).
It looks like neither PAP2T-NA, SPA2201 or SPA 3201 have this capability. Or I am wrong and missing something?

[FONGO_steve]

Going to move this post to FAQ - device configuration is simply a place to share known working configs.