I have a asterisk server in Turkey(150Mbit/s symmetrical BW) and some agents in Egypt (50 Mbit/s symmetrical BW). Two office is connected via IPsec (Fortigate Fw in Turkey , Pfsense in Egypt.) Meanwhile we are communicating VoIP provider via private network.
The connection between offices is about 10Mbit/s over ipsec. The agents in Egypt is able to make outbound and inbound call. When they are on phone sometimes their voice is breaking. I tried to enable jitter but I could not be successful.