On Sat, Apr 11, 2009 at 12:53 PM, David Aldworth daldworth@teliax.com wrote:

I'm am attempting to return a 503 "Service Unavailable" after my kamailio server sends the provisional response to customer UA if we cannot find a route for the call. I am using:

t_reply("503", "Service Unavailable");

However this results in:

ERROR:tm:w_t_reply: failed to send a t_reply to a message for which no transaction-state has been established

Reading up on t_reply, it clearly states: "Sends a stateful reply after a transaction has been established." So, I guess thats means even though we have received the invite, and send 100 Trying back, a transaction does not actually exist.

So, my question is, how do I tell the sending UAC that we are 5XX so that it can stop sitting there waiting for session progress?

Hello, you can send the reply statelessly: sl_send_reply("503", "Service Unavailable" );

or statefully: t_newtran(); t_reply("503", "Service Unavailable");

Before you can use t_reply, a transaction must be established. This can be done explicitly calling t_newtran() or it will be do internally by other functions like t_relay.

regards, takeshi.