Hi all, This message is somewhat related to a preceding one (Simple SER Use Case), because I realised I did not ask the right question. Here it is: I want to make a proxy that will try to locate the callee by sequentially trying n different UA, by sending an INVITE and waiting for either OK or timeout to occur. On timeout, the proxy will try the next UA. The detail here is that the proxy sends a "100 Trying" to the caller *before* contacting the various UA, and that *no more* "100 Trying" are forwarded by the proxy, which absorbs those responses from contacted UA. Jiri indicated that the configuration presented in <http://www.iptel.org/ser/doc/seruser-html/x510.html#AEN616> realised the scenario I was mentioning... but it seems to me that the proxy does not send and then absorb "100" responses, but rather relays this responses to the caller. This would lead to the caller receiving as many "100" responses as contacted UAs. Is it possible to do this with SER ? TIA, -- Sebastien