[Serusers] SER pre-release - Presence and NOTIFY

Sun Nov 12 22:50:42 CET 2006

Thanks Bogdan. Although what you described is close to my problem ( I have 
no issues with received parameter, etc.) but there are some differences. I 
will try to explain in more detail:

1) THe SER Proxy is 0.9.6
2) The Presence Server is the pre-release version
3) All cllients register with SER Proxy and SER Proxy is responsible for 
handling all voice calls. For each client that registers with SER Proxy, the 
REGISTER is replicated (using t_replicate) to Presence Server.  I have a 
client behind a NAT. When it registers with the SER Proxy, I see the 
following when I do a serctl ul show (Please note that the contact 
information shows the PUBLIC IP (or received) and not the Private IP)

<sip:444 at 70.80.94.164:11352;rinstance=cd44c78b61d6ebe9>;q=0.1;expires=3574

4) When this REGISTER is forwarded to PRESENCE SERVER, I see the following 
in the location table on the presence server:

uid=444
aor=sip:444 at xxx.sip.com
contact=sip:444 at 70.80.94.164:11352;rinstance=cd44c78b61d6ebe9
received=NULL
etc.

As you see, the contact information is the same as on SER Proxy.

5) Now, when the PRESENCE server sends a NOTIFY to 444 whenever a presentity 
444 is watching changes status, the NOTIFY is sent to the SER PROXY IP,  but 
the URI is:

(DESTINATION IP ADDRESS IS THAT OF SIP PROXY)
NOTIFY sip:444 at 70.80.94.164:11352 SIP/2.0
Via: SIP/2.0/UDP PRESENCE_SERVER_IP....

SER PROXY then receives this packet and forwards it directly to the IP 
70.80.94.164:11352. Now in most cases, my client receives this NOTIFY and 
sends a response back to SER PROXY and it displays the status of the 
presentity correctly. But sometimes, due to some unknown reason, my client 
does not receive this NOTIFY.

6) What I would like to see/know is whether PRESENCE Server can send a 
NOTIFY to the SER PROXY with the following URI:

(DESTINATION IP ADDRESS IS THAT OF SIP PROXY)
NOTIFY sip:444 at xxx.sip.com
..

I hope this clarifies the issue.Is there a solution to this?
Thanks in advance.

>From: Bogdan Pintea <pintea at iptego.de>
>To: SER LIST <sergrp at hotmail.com>
>CC: serusers at iptel.org
>Subject: Re: [Serusers] SER pre-release - Presence and NOTIFY
>Date: Sun, 12 Nov 2006 15:05:08 +0100
>
>If I got it right, your problem is that your SER acting like a proxy
>does not "feel" it is responsible for the NOTIFY originated at your SER
>acting like a presence server and tries to route it by RURI, which is in
>this case a private IP, leading to routing failure.
>
>I also figure that your proxy server is bound to a public IP - otherwise
>the proxy would correctly handle the forwarding - and you have (some)
>clients behind NAT.
>
>In this case, the best solution might not be fixing the RURI the way you
>want*.
>
>With the latest (prerelease) version of SER you could try a solution like:
>- handle the NAT case at the SER that is contacted first by your clients
>- your proxy; check iptel's site for how to do this; what's most
>important is that the REGISTER leaves from proxy to presence server
>having the "received" RURI parameter attached.
>- presence server attaches "back" this parameter to NOTIFY's RURI
>(<<modparam("registrar", "received_to_uri", 1)>>).
>- instruct SER proxy to forward the NOTIFY based on this "received"
>parameter (<<xlset_destination("%@ruri.params[\"received\"]")>>).
>[this is a genuine new Ottendorf feature**; find it in 'avp' module].
>
>
>Hth,
>Bogdan.
>
>
>* because:
>SER simply inserts into RURI the binding address for the AOR - and this
>is the correct thing to do.
>This AOR (sip:444 at sip.xx.com) is what the subscriber inserted into the
>To header at registering time.
>The binding address (sip:444 at 10.1.1.1:12321) is what the subscriber
>inserted into Contact header at registering time.
>
>Most of the clients don't even ask you want to insert as Contact (and
>well they do) and simply put their IPs there or the gateway's IP if STUN
>capable.
>
>Unless you run yet another registrar on the proxy, SER would still not
>know where to forward the NOTIFY.
>In case you do, both proxy and presence servers would lookup the binding
>for AOR, which is performance unwise; moreover in case of multiple
>bindings for an AOR you might  end up staring n^2 transactions on the
>proxy and n NOTIFYs received by subscriber.
>
>** current implementation remained broken: you need to apply the patch
>for bug #125.
>
>SER LIST wrote:
> > Hi, I have SER Proxy and PRESENCE running on different machines.
> > REGISTERS are being forwarded by SER Proxy to PRESENCE and PRESENCE is
> > storing the location information in "location" db.
> >
> > What I am seeing is that when the PRESENCE Server sends NOTIFYs to
> > watchers, it sends them to the SER PROXY (destination IP Is that of
> > SER PROXY) but the URI in NOTIFY is that of the watchers LOCATION
> > INFO. Is this correct? I would like the NOTIFY URI to contain the SIP
> > DOMAIN and not the contact info.
> >
> > e.g. user 444 registers with SER PROXY (sip.xx.com). It is registering
> > from 10.1.1.1:12321 (location info).  SER PROXY sends the REGISTER TO
> > Presence server which stores this info in location database (location
> > is 444 at 10.1.1.1:12321). Now when Presence Server sends NOTIFY, it
> > sends it to the SER PROXY IP BUT the NOTIFY URI IS:
> >
> > NOTIFY sip:444 at 10.1.1.1:12321 SIP/2.0
> >
> > How can I have the NOTIFY URI to be :
> >
> > NOTIFY sip:444 at sip.xx.com SIP/2.0
> >
> >
> > Any suggestions would be higlhy appreciated.
> >
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> > Serusers at lists.iptel.org
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> >
>
>
>--
>Bogdan Pintea
>
>iptego GmbH  -  VoIP Security
>http://www.iptego.de
>

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