VoIP in Ad-hoc n/w

HI,
Need help in desiging VoIP service for Ad-hoc n/ws. Objective
is that there should be no cenralised point in it. It will be useful
in scenarios like Disasters when different teams arrive and they need
to communicate.

*It will use sip to communicate, (each node will be having sip server
and client)
*Routing protocol in Ad-hoc n/w will be AODV
*Each node has to broadcast its presence ..
Telecom, Cabling and VoIP continues...
Tags: telecom cabling fiber optic