[Serusers] SER service: registration problem (load balancing quirk?)

[Jiri Kuthan]

thanks Tom for reporting -- we will investigate, send me the PCAPs privately please. -jiri

At 09:49 22/01/2008, Tom van der Geer wrote:
>Dear SER users,
>
>I'm experiencing occasional problems with my SIP clients registration to 
>the (free) iptel.org SER service. I'm not sure if this is the place to 
>ask questions regarding this service. If not, please give me a pointer 
>who/what I should contact.
>
>I've made 2 tcpdumps. 1 from a failing registration request and  from a 
>successful registration request. The setup for both situations is the 
>same. These captures were made within 40 minutes from each other.
>
>In both cases the first registration attempt is replied with a 401 
>Unauthorized (obviously) which request for authentication. In both cases 
>my SIP client (SJPhone) replies correctly (I assume) with a new 
>registration and the requested account credentials. In the case of a 
>successful registration the SER replies with a 200 OK. In the case of a 
>failing registration my SIP client receives another 401 Unauthorized 
>message. What struck me is that this second 401 is sent from another SER 
>system. (The "Server:" header from the first registration attempt is 
>different from the second registration attempt.)
>The first header has "Server: Sip EXpress router (2.1.0-dev16-tcp 
>(i386/linux))" while the second 401 has "Server: Sip EXpress router 
>(2.0.0-rc5 (i386/linux))". (note the difference in SER versions)
>I've verified that in the case of a successful registration the Server 
>header in the first (401) and second (200) response are the same: 
>"Server: Sip EXpress router (2.1.0-dev16-tcp (i386/linux))"
>
>Is this some kind of weird load balancing quirk?
>
> From a security point of view I don't want to send my TCP Dumps (with 
>my authentication) to the mailing list, but I can send it to a personal 
>email address when required.
>Thanks,
>
>Tom
>
>
>
>
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--
Jiri Kuthan            http://iptel.org/~jiri/