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

make sure to also use handle_ruri_alias() http://kamailio.org/docs/modules/4.0.x/modules/nathelper.html#idp16851488 for requests from the proxy->lb->client

see the default kamailio config for proper usage of handle_ruri_alias() and add_contact_alias()

regards klaus

On 27.06.2013 02:34, Allen Zhang wrote:

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

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