[Serusers] REGISTER NAT Failure

[Jiri Kuthan]

At 10:59 PM 10/3/2004, Michael Shuler wrote:
>SER doesn't seem to be returning the Unauthorized message to the correct
>port, but it does get at least the right IP.

It does return the replies to correct port. RFC3261 mandates the replies
to be sent to the port advertised in Via, which is implicitely 5060.
Solid clients are symmetric and advertise it as specified in RFC3581;
then SER sends replies back symmetrically. You can force it do it
anyhow using force_rport at the risk of confusing non-symmetric clients.

-jiri

>  You will notice the REGISTER
>is received on 216.43.27.75:56059 but the Unauthorized is sent back to
>216.43.27.75:5060.  Is there any way to get SER to send back to the correct
>port so symmetrical NAT will work correctly?
>
>
>
>
>U 216.43.27.75:56059 -> 198.88.216.87:5060
>  REGISTER sip:bwsys.net SIP/2.0..Via: SIP/2.0/UDP
>192.168.1.119:5060;branch=z9hG4bK2309979991..From: SafeWayLine1
><sip:SafeWayLi
>  ne1 at bwsys.net>;tag=1023220770..To: SafeWayLine1
><sip:SafeWayLine1 at bwsys.net>..Call-ID: 3966543944 at 192.168.1.119..CSeq: 15
>REGIS
>  TER..Contact: <sip:SafeWayLine1 at 192.168.1.119:5060>..max-forwards:
>70..user-agent: Azacall200..expires: 60..Content-Length: 0..
>  ..
>
>#
>U 198.88.216.87:5060 -> 216.43.27.75:5060
>  SIP/2.0 401 Unauthorized..Via: SIP/2.0/UDP
>192.168.1.119:5060;branch=z9hG4bK2309979991;received=216.43.27.75..From:
>SafeWayLine
>  1 <sip:SafeWayLine1 at bwsys.net>;tag=1023220770..To: SafeWayLine1
><sip:SafeWayLine1 at bwsys.net>;tag=ceb07c727e9d78dd71cafc9196e2f4
>  a7.535c..Call-ID: 3966543944 at 192.168.1.119..CSeq: 15
>REGISTER..WWW-Authenticate: Digest realm="bwsys.net", nonce="416067d1a3983
>  6e4022698b6217bab605b990a18", qop="auth"..Server: Sip EXpress router
>(0.8.14 (i386/linux))..Content-Length: 0....              
>
>
>----------------------------------------
>
>Michael Shuler, C.E.O.
>BitWise Communications, Inc. (CLEC) And BitWise Systems, Inc. (ISP)
>682 High Point Lane
>East Peoria, IL 61611
>Office: (217) 585-0357
>Cell: (309) 657-6365
>Fax: (309) 213-3500
>E-Mail: mike at bwsys.net
>Customer Service: (877) 976-0711 
>
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--
Jiri Kuthan            http://iptel.org/~jiri/