Thank you for your interest in Zoiper.
Zoiper Gold package includes:
ZRTP with TLS*
Wideband audio (G.726, Speex wide, G.722)
* TLS is available in all versions.
Between 2 and 50 Euro
How to obtain it:
Go to Config -> Premium features -> purchase all functionality with any payment on the scale from 2 to 50 Euro.
G.729 is sold separately due to its licensing.