Hi,
I have been developing my SIP Client on a embedded system and I used Trixbox
to act as a SIP Server. The transactions from my SIP Client to the Trixbox
SIP Server were something like this as shown below.........


SIP Client
Trixbox(Server)

                                 INVITE
--------------------------------------------------------------------------------->

                               100 Trying
<---------------------------------------------------------------------------------

                               200 OK
<---------------------------------------------------------------------------------

                               ACK
--------------------------------------------------------------------------------->

                         MEDIA SESSION (RTP)
<--------------------------------------------------------------------------------->

                              BYE
<---------------------------------------------------------------------------------


Now I planned to go a step ahead and planned to establish a connection to a
soft-phone in my case I chose X-Lite. I added an extension for the X-Lite in
my Trixbox so that the account for X-Lite is enabled.  On the other hand
when I try to connect my SIP Client with X-Lite, as soon as it receives
INVITE from SIP Client, the X-Lite sends 401 Unauthorized message. Once i
get this 401 message I again retransmit a re-Invite message back to the
X-Lite but still it sends me 401 message.

Can somebody let me know what is going on with my transactions here.

Regards
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