Settings are as follows:
Device number: Your device number
Password: Your password
SIP/Proxy registrar: voip.hellasvoip.com
Port:5060 or 5070 (preferred)
Also you can connect by using the following IP addresses:
For SIP: 46.4.60.4
Following codecs are supported:
G.711 (64 kbps)
G.726 (32 kbps)
G.729 (8 kbps)
G.723 (5.3 & 6.3 kbps)
GSMFR (13 kbps)
iLBC (20ms & 30ms)