[SIPForum-discussion] Port Unreachable on SIP Register

[Aizon, Stephen, VF-NZ]

Hello Paul,

The destination is unreachable and therefore the reason why there is no response as you can see the protocol used below is ICMP...

You need at least to reach that destination IP first via ICMP so that you can get a SIP response back with the desired Message for your Registration to be successful.

Cheers,

Stephen

From: Paul Blades [mailto:paulblades at tiscali.co.uk]
Sent: 28 November 2011 11:01 a.m.
To: discussion at sipforum.org
Cc: Aizon, Stephen, VF-NZ
Subject: Port Unreachable on SIP Register


Hi,
     I'm looking for abit of SIP expertise on a problem with a SIP register with the sip2sip server. I have this working with
Xlite-4 but not with the open-source PJSIP  pjsua application. A wire shark trace indicates that the register sent from pjsua
Is not targeting the correct port yet the register looks the same as that for the Xlite-4 except that the destination ip address
last three digits are different:-

Xlite-4:
81.23.228.150

Pjsua:
81.23.228.140

The same information was input into Pjsua as Xlite-4. So its seems odd that the destination address is different (I guess
the port number is not part of the IPv4 address so not sure what port number is being used).



Working Xlite-4 SIP call:-
No        Time                 Source                          Destination       Protocol             Info
19         0.476562           <Src IP addr>                81.23.228.150    SIP       609       Request: REGISTER sip:sip2sip.info
20         0.546875           81.23.228.150                <Src IP addr>    SIP       571       Status: 401 Unauthorized    (0 bindings)
21         0.548828           <Src IP addr>                81.23.228.150    SIP       805       Request: REGISTER sip:sip2sip.info
22         0.656250           81.23.228.150                <Src IP addr>    SIP       614       Status: 200 OK    (1 bindings)



PJSIP pjsua application:-
No        Time                 Source                          Destination       Protocol             Info
24         80.093750         <Src IP addr>                81.23.228.140    SIP       590       Request: REGISTER sip:sip2sip.info
25         80.156250         81.23.228.140                <Src IP addr>    ICMP    590       Destination unreachable (Port unreachable)



The explaination for Port Unreachable is:-

"Unlike the Network Unreachable and Host Unreachable messages which come from routers,
the Port Unreachable message comes from a host. The protocol (TCP or UDP) tried to send the data
up to the destination port number (TCP or UDP port) and the port process didn't exist. The protocol handler
then reports Destination Unreachable - Port Unreachable."



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