[SR-Users] kamailio loadbalancer with TLS problem forwarding INVITE back to UA

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