Bob, I requested this quite some time back (see
http://www.obitalk.com/forum/index.php?topic=141.0) and back then I received this reply from OBi-Guru:
QuoteAdding SP3 and SP4 would not be possible on the same OBi.
However, this can be done by adding another OBi (or more), and have it daisy-chained with the first one, connected via OBi numbers in the gateway slots.
To be honest, when I received that reply my thought was to wonder why that should be the case. I assumed it was due to memory constraints and didn't press the issue, but since then they've added several new features, among them the ability to record and store custom prompts, which I'm sure takes up considerable memory. So now I'm even a more skeptical that this couldn't be done if someone at Obihai really wanted to see it implemented.
In that particular thread, there were six other people (besides me) that also wanted that feature:
Fabri
biomesh
Telecomgeek
plugger2
Thunderbird1
GizmoChicken
In addition, plugger2 had started a thread about gateways, at
http://www.obitalk.com/forum/index.php?topic=246.msg1138#msg1138 — in looking at that thread, it appears to me that what at least some of those folks might have really wanted was the ability to have more than two Service Providers.
Given that a fair amount of time has passed since the above threads were posted, my hope would be that perhaps the Obihai folks have figured out some new programming techniques, or how to use memory more efficiently, or something that might induce them to take another stab at this.
I don't know about anyone else, but at least in my case the goal would NOT be to be able to use all the SP providers simultaneously. I would be fine with a limitation that there could only be two ACTIVE calls at a time (or whatever the Obihai currently supports). The only thing I would want is the ability to register with more than two providers so that the additional providers could be selected for outgoing calls, and so that I could receive incoming calls from any of them. If I have reached the limit for active calls, I'd be fine with the Obihai device sending congestion or busy if an additional call tries to come in (in fact, that would probably be exactly what I'd want it to do - juggling two calls at once is enough of an issue!).
Even if it absolutely can't be done on the OBi110, you'd think it could be done on the OBi100, since that doesn't have a line port to deal with. At least maybe add an SP3 in place of the missing LINE port?
So this is my roundabout way of saying that I wholeheartedly support this request, and I hope that those who chimed in on those earlier threads will add their support to this one. Please, Obihai, can't you figure out some way to make this work?