I am trying to set up a SIP/RTP public announcement infrastructure. Basically there are several slave user agents that are configured to answer automatically, and a master UA which should be able to call all of them and make announcements.
A way to work around seems creating a conference and making all UAs to join via some RPC mechanism but I don't want to go that direction unless I have to.
The slave UAs are linphone and I haven't decided on the master agent yet.