Fwd: Can Kamailio be used to redirect media between a client that switches from wifi to 3g/gsm - sr-users

22 Jun 2012

Forgot to post the response to the list as well.

Date: Fri, Jun 22, 2012 at 6:57 AM
Subject: Re: [SR-Users] Can Kamailio be used to redirect media between a
client that switches from wifi to 3g/gsm
To: Klaus Darilion &lt;klaus.mailinglists(a)pernau.at&gt;

Thanks for the response! I see a series of what I believe are re-REGISTER
statements:

Message sent: (to dest=75.101.244.XXX:5060)
REGISTER sip:75.101.244.XXX SIP/2.0
Via: SIP/2.0/UDP 10.165.27.161:2407;rport;branch=z9hG4bK1839704852
From: <sip:990XX@75.101.244.XXX>;tag=1689684502
To: <sip:990XX@75.101.244.XXX>
Call-ID: 1867622191
CSeq: 1 REGISTER
Contact: <sip:990XX@10.165.27.161:2407;line=daeb0d9351eff22>
Max-Forwards: 70
User-Agent: Linphone/3.4.0 (eXosip2/unknown)
Expires: 3600
Content-Length: 0

Received message:
SIP/2.0 401 Unauthorized
Via: SIP/2.0/UDP 10.165.27.161:2407;received=32.158.143.61
;rport=2407;branch=z9hG4bK1839704852
From: <sip:990XX@75.101.244.XXX>;tag=1689684502
To: <sip:990XX@75.101.244.XXX>;tag=c97b4d1cb1f3d0da549e06a8d482ef63.e10d
Call-ID: 1867622191
CSeq: 1 REGISTER
WWW-Authenticate: Digest realm="75.101.244.XXX",
nonce="4fe476e500000e00aa8700d49b8c668f4c6f1e6a367f2XXX"
Server: Kamailio
Content-Length: 0

REGISTER sip:75.101.244.XXX SIP/2.0
Via: SIP/2.0/UDP 10.165.27.161:2407;rport;branch=z9hG4bK123406454
From: <sip:990XX@75.101.244.XXX>;tag=1689684502
To: <sip:990XX@75.101.244.XXX>
Call-ID: 1867622191
CSeq: 2 REGISTER
Contact: <sip:990XX@10.165.27.161:2407;line=daeb0d9351eff22>
Authorization: Digest username="990XX", realm="75.101.244.XXX",
nonce="4fe476e500000e00aa8700d49b8c668f4c6f1e6a367f2XXX",
uri="sip:75.101.244.XXX",
response="1e1d558894f2c05c322c76efbb2f9XXX",
algorithm=MD5
Max-Forwards: 70
User-Agent: Linphone/3.4.0 (eXosip2/unknown)
Expires: 3600
Content-Length: 0

Received message:
SIP/2.0 200 OK
Via: SIP/2.0/UDP 10.165.27.161:2407;received=32.158.143.61
;rport=2407;branch=z9hG4bK123406454
From: <sip:990XX@75.101.244.XXX>;tag=1689684502
To: <sip:990XX@75.101.244.XXX>;tag=c97b4d1cb1f3d0da549e06a8d482ef63.8b5a
Call-ID: 1867622191
CSeq: 2 REGISTER
Contact: <sip:990XX@10.165.27.161:2407;line=daeb0d9351eff22>;expires=120,
<sip:990XX@50.43.101.83:51879;line=59ecc207f06f4e9>;expires=81
Server: Kamailio
Content-Length: 0

But after this I would expect to see an INVITE but one is never sent, but
if I switch back to the original IP on that device the call is reconnected,
so it proves we're missing an INVITE I believe. What do I need to do on the
server side to force a re-INVITE to be sent after this registration occurs?
Thanks!

On Fri, Jun 22, 2012 at 1:14 AM, Klaus Darilion <
klaus.mailinglists(a)pernau.at&gt; wrote:

...
  Hi Shaun!

 Your problem description is too short to give you any good help.

 Use tcpdump (or other tools) to capture the scenario with Asterisk and
 Kamailio. Then compare them to find out why it doesn't work.

 Is media sent directly to Asterisk then it ca not be the problem of
 Kamailio.

 I hope the mobile client is smart enough to also send a reINVITE when
 getting the new IP address (of the mobile connection) with proper Contact
 header - otherwise it can not receive SIP requests from Asterisk.

 regards
 Klaus

 On 20.06.2012 18:07, Shaun Clark wrote:

  The use case is that I have a SIP client
registered to Kamailio talking
 to an Asterisk box connected to the PSTN. The client is a mobile phone
 and the user is connected to wifi. The user then steps out of wifi range
 and the phone drops the connection and picks up the 3g data connection.
 I want the media stream to reconnect to the client and the call to
 resume without having to redial. This works now if the client is
 directly connected to the Asterisk machine, but not when I am routing
 through my Kamailio server. How do I go about this, examples are always
 appreciated, thanks!

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