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[SFtrack] Created: (XECS-1607) call pickup problem (presumably dialog event package on LG-Nortel phones work inaccurately)

call pickup problem (presumably dialog event package on LG-Nortel phones work 
inaccurately)
-------------------------------------------------------------------------------------------

                 Key: XECS-1607
                 URL: http://track.sipfoundry.org/browse/XECS-1607
             Project: sipXecs
          Issue Type: Bug
          Components: LG 6800 Phones
    Affects Versions: 3.10.2
         Environment: SIPxchange ECS (3.10.2-013153 2008-07-22T03:38:43 
oem-centos5)
LG-Nortel phones with firmware  1.2.38sp
Snom 360 phone with firmware 7.3.7 14671
            Reporter: Nikolay Kondratyev
            Priority: Critical
         Attachments: dump1, sipx-configuration.tar.gz

The problem is that when the call is going from snom360 phone to LG-Nortel 
phone and another LG-Nortel phone tries to pickup the call, pickup fails.

Network trace in tcpdump format is attached. 
Sipxsnapshot with debug logging level is also attached.
The time of the call is Wed Aug 13 08:25:44 UTC 2008.

The call is as following:
The snom 360 phone (ext. 3805, ip 172.23.12.229) calls ext. 3800 (lg-nortel 
6830 phone, 172.23.12.246).
Sipx address is 172.23.12.104.
Then lg-nortel 6812 phone (ext. 3803, 172.23.12.242) tries to pickup the call.

But when sipx sends "Invite with replaces" to snom phone (packet 56 in the 
attached trace), snom phone answers with 404 not found and pickup fails.

My analysis is as following:
I noticed that snom phone is registered at sipx with the following contact 
(shown in diagnostics->registration page in the sipx UI) uri:  
<sip:3805@xxxxxxxxxxxxx:2051;line=za5gatgk>
And initial invite in the attached trace (packet 23) contains the same contact 
uri.
I compared attached trace with successful call pickup, when the call is 
originating from mp118, and with basic call to snom phone.
I noticed, that when making basic call to snom phone, request line of the 
invite message is 
INVITE sip:3805@xxxxxxxxxxxxx:2051;line=za5gatgk SIP/2.0

And when sipx sends "invite with replaces" to snom phone during call pickup, 
the request line is
INVITE sip:3805@xxxxxxxxxxxxx:2051 SIP/2.0

My idea is that snom phone does not like, that request line does not contain 
"line=za5gatgk ", and answers with "404 not found".

As far as i understand full URI (string included between < > must be used.

When creating "invite with replaces" sipx, as far as i know, copies uri and 
tags from the body of Notify message (packets 47 and 51 in attached trace) 
recieved from ext.6800 lg-nortel phone.
Here is the body of packet 47:
<?xml version="1.0"?>
<dialog-info xmlns="urn:ietf:params:xml:ns:dialog-info" version="0" 
state="full" entity="sip:3800@xxxxxxxxxxxx">
<dialog id="16b7eb0" call-id="3c267c70b576-fxtoi35agsbl" 
local-tag="94bf47b8-ac170cf6-13c4-c5b-219cd5ca-c5b" remote-tag="8q6qek5d4d" 
direction="recipient">
<state code="180">early</state>
<duration>4</duration>
<local>
<identity>sip:3800@xxxxxxxxxxxx</identity>
<target uri="sip:3800@xxxxxxxxxxxxx:5060"/>
</local>
<remote>
<identity>sip:3805@xxxxxxxxxxxx</identity>
<target uri="sip:3805@xxxxxxxxxxxxx:2051"/>
</remote>
</dialog>
</dialog-info>

Uri is specified without line=za5gatgk part, though contact uri of initial 
invite (packet 23) contains it.

Please advise if my anaysis is correct.

The above problem means, that in mixed phone environment (snom and lg-nortel) 
call pickup feature can not be used.

Thanks and regards,
Nikolay.

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