There is no need for a SIP server or STUN or DNS. Those addresses are
permanent (derived from the cjdns private key).
Note that sRTP only protects the audio/video - not the SIP control
packets. However, cjdns is not anonymous, and a competent spy can
still figure out which cjdns ips you are talking to. (But not what
packets you are sending - although SIP calls have a recognizable
Stuart D. Gathman <[hidden email]>
"Confutatis maledictis, flamis acribus addictis" - background song for
a Microsoft sponsored "Where do you want to go from here?" commercial.