On 19.01.2010 16:49, Medakkar, Sachin (Sachin) wrote:
Hi --
I've just downloaded and installed SEMS to try and use, but am having
a little difficulty in receiving its responses. I have a SIP Servlet
that is sending an INVITE to SEMS over UDP from a random socket it has
opened (e.g. port 8111) and expecting to receive a response at port
5070 as defined in the topmost Via header it has added.
It seems to me that SEMS is sending responses to the same port that it
the request was sent along (i.e 8111) instead of 5070.
Could you confirm whether SEMS sends its responses over UDP to the
*address AND port* defined in the top most Via header?
No, it is sent to the IP/port the request has been received from, which
is the most reliable method. Let's think of NATs and what the UAC thinks
his address/port is... Doing that 100% rigth would require a STUN server
to be hosted at the same ip/port as SEMS, so that the same outbound port
is used on the NAT. Only this way, the UAC gets a chance to guess its
real ip/port.
Regards,
Raphael.
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