Hi, Our set up: UA1 ----- ------ Proxy1 \ / Loadbalancer (dispatcher module) / \ UA2----- ------ Proxy2 Both proxies have registrar module loaded and share the same database. REGISTERs work fine. The problem is this: TLS TCP UA1 ----------------------> LB --------------------> Proxy INVITE(to UA2) INVITE(to UA2) TLS TCP UA1 <------------- LB <------------- Proxy 100 Trying TLS TCP UA1 <------------- LB <----------------------- Proxy INVITE(to UA2) TLS TCP UA1 <----------------------- LB <----------------------- Proxy 100 Trying All above worked fine. Below is what's expected but never happened: TLS TCP UA2 <----------------------- LB <----------------------- Proxy INVITE(to UA2) We'd like the LB to reuse the TLS connection initiated by UA2. But LB can't find an open connection and tries to start a new TLS connection. The new connection fails. UAs are not behind NAT at the moment but will be in the future. Tried this approaches on LB: route(ADD_CONTACT_ALIAS); If (not from proxy) t_relay(); else do load balancing No luck. Any help is appreciated. Regards, Allen