One reader indicates that they think the process of changing the active VOIP account on a snom m3 is troublesome. Here’s a short video I did some time ago documenting the keystroke sequence using my snom m3.
The phone supports up to 8 separate registations. This means that it can take incomming calls from eight separate sources. However, when making outgoing calls it only uses one of the accounts. You can set which one that is by default for each handset.
In my experience this is not a problem, as I make all outgoing calls through one account anyway. But by allowing multiple registrations I can take calls from auxillary services like Free World Dialup, IPKALL, IdeaSIP, etc.