The purpose of projet is to implement a VoIP secure solution with Kamailio as core IMS network.
In this project VoIP call will be established with zRTP. SBC is transparent for zRTP call, zRTP is establish between 2 end point (terminals), SBC don't decrypt or encrypt the call. Thus SBC don't modify codec.
Is there a SBC solution provided by Kamailio ?

How is managed the SBC failover mecanism ? is there SBC backup ?
What is the status of context registered in Kamailio (P-CSCF & S-CSCF) in case of SBC failure ?

    - Is it deleted automatically ?

    - dispatched to another SBC (backup SBC) ?

Is there mecanism in Kamailio to check SBC overload and manage a dispatching of zRTP call to available SBC ?

Question related to P-CSCF and S-CSCF :
    - Is there redundant function (such as active/active or active/standby solution) of contextual data (customer data stored at the registration REGISTER on P-CSCF and S-CSCF) ?