Here are descriptions of the more relevant changes in EVSS 3.4

PrivateGSM changes

The main change is full and certified support for IOS-7

No other major changes or features are present

PrivateServer changes

SIP trunks management

Trunks configuration can be immediately tested and their status is reported in realtime by web console.

Secure SIP trunks

This version or PrivateServer carries full support for secure SIP trunks. It is now possible to configure trunks to use SIP over TLS and SRTP to fully encrypt calls between PrivateServer and other PBX, such as Cisco Call Manager.

In case of secure trunks, it is possible reject insecure calls playing a message to users that will be warned about the security issue