Settings are as follows:

Device number: Your device number
Password: Your password
SIP/Proxy registrar: sip.d4u.cloud

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)