[Serusers] Absorbing provisional responses

Jiri Kuthan jiri at iptel.org
Fri Feb 21 12:14:33 CET 2003

At 11:48 AM 2/21/2003, Sebastien Pierre wrote:
>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

that's a meaningful scenario.

>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.

that's of course how a 3261 proxy should work.

>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.

I retried it just now and it worked correctly. I guess the error you
are observing lives somewhere else. A frequent reason is broken 
Vias received from UAS.


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