[Users] strange behaviour from clients

[nick]

Andreas Granig wrote:
> Nick,
> 
> Any special reason why your're using port 5061? It's the port for sips 
> (sip over TLS), so maybe the client doesn't like that? Try 5060, maybe 
> that helps.
> 
> Beside that, can you ensure the client got that response? Any NAT in 
> between?
> 
> Andreas
> 

I was using 5061 because it's a VM running on the same server, and this 
way I was able to filter the traffic when looking at the ngrep output...

I just got a mail from Xlite support they said the problem was probably 
this: Mobilia SIP Server.

My server header/signature was confusing the clients, as soon as I 
removed it, everything works perfectly... probably I need to learn a bit 
more about what can go in headers.