[martin]

Voice traffic is typically not encrypted.

There are a number of different ways to implement encrypted voice like SRTP and more recently Phil Zimmermann's ZRTP

These solutions require the participation of all end points (including providers)

Until one of these standards is widely adopted by the majority of providers, it does not make sense for Voxalot to support any.

Personally, I am interested to see how ZRTP pans out.