I've had some decent success with a couple Unidata phones. My only qualms were lack of transfer buttons, which you can get around by using specified star codes.
I believe the Snom M3 has WiFi support as well, which might be a great option if these clients are of higher importance.
As for smartphone sip clients, I've a strong love for Bria on the iPhone (aside from the battery kill while letting it background).
cSipSimple on the Android market is very nice, integrates with the OS and native phone system quite well without such a dramatic hit to the battery as far as I can tell.
On Mon, Apr 4, 2011 at 3:38 AM, Michael Kennedy
<Info@kennedysoftware.ie> wrote:
These are most interesting links/products, Thomas. Thank you very much.
I knew nothing about either, and have spent the past 2 hours reading up
about them - and have "only started"!
Very many thanks.
- Mike