while wait for seacom etc is on, I've been testing on my Nokia E71 ( symbian 60 ) phone. Just as gps and maps have become a norm, I've successfully tested over the last 6 months and can list these for you. While Nokia has builtin voip settings, I preferred to use a standard SIP client that will work on most symbian devices and any providers. Am still to test on Winmo 6.1 pro.

 

Software : Uniphone by Optimobile : http://www.optimobile.se/

Cost : 25 Euros ( online )

Usage networks : Data Wifi

Codecs supported : G.711 (u-law and a-law), GIPS iLBC (30 ms) and Enhanced G.711

 

Tests conducted : On Wifi only. test provider was nice enough to mail my logs to me. With these it was possible to see the errors and corrections needed on their asterisk system.

 

Results : Excellent voice quality, requires a minimum of duplex 64kbps for G711. Sat delay and some jitter was as exptected. 

 

sharing my thots. ( corrections are welcome ). :-)

 

Rgds.