[SR-Users] Kamailio v4.0.2, iPhone, TCP connection and PJLIB

[Vitaliy Aleksandrov]

If you won't be able to disable SIP ALG on your router you can fill 
$avp(received) manually before calling save():
     $avp(received)  = "sip:" + $si + ":" + $sp + ";transport=" + $proto;

In this case all user location records will have the "received" attribut 
even if a UA isn't behind NAT, but I don't see any problems with that.

> On 08/14/2013 11:51 AM, Roberto Fichera wrote:
>> On 08/14/2013 11:31 AM, Daniel-Constantin Mierla wrote:
>>
>> Hi,
>>
>>> Hello,
>>>
>>> On 8/14/13 11:26 AM, Roberto Fichera wrote:
>>>> On 08/14/2013 11:20 AM, Daniel-Constantin Mierla wrote:
>>>>
>>>> Hi,
>>>>
>>>>> Hello,
>>>>>
>>>>> On 8/14/13 11:16 AM, Roberto Fichera wrote:
>>>>>> On 08/14/2013 10:19 AM, Daniel-Constantin Mierla wrote:
>>>>>>
>>>>>> Hi,
>>>>>>
>>>>>>> Hello,
>>>>>>>
>>>>>>> as you can see in the REGISTER, the phone give a public IP where it can be contacted and kamailio tries to deliver to
>>>>>>> that address sip:528 at 94.94.X.X:1274;transport=TCP
>>>>>>>
>>>>>>> REGISTER comes from another port, but that is allowed in SIP.
>>>>>> Yep! That's the problem
>>>>>>
>>>>>>> You should disable stun in the client and let the server care of nat traversal.
>>>>>> As already said all client doesn't use any stun-
>>>>> then how they discover the public IP address if they are behind NAT? Or did I misunderstand that they are behind NAT?
>>>> Yes! They are behind NAT! Shouldn't kamailio detect such behaviour so it will change the contact header and the other
>>>> fields accordingly using the nat_fix_XXXX functions?
>>> detection of whether a device is behind nat is done based on comparing source IP of the packet with the IP addresses
>>> in the SIP message. It is no other way from application point of view.
>>>
>>> If you look at the trace, the REGISTER has only public IP addresses, no private address. Also, the Via header is
>>> perfectly matching the the source IP and port of the packet.
>> Mhhh!!! That's true!
>>
>>> Therefore, if the device is behind a nat in a private network, how does it discover the public IP or the NAT router?
>>> Is the nat router running a SIP ALG? Can you get the SIP trace on the device itself?
>> Good question! It's a cisco 877 but the conf doesn't have any kind of SIP related configuration. Does it handle
>> transparently the SIP traffic?
>>
>> Cisco IOS Software, C870 Software (C870-ADVIPSERVICESK9-M), Version 12.4(15)T5, RELEASE SOFTWARE (fc4)
>> Technical Support: http://www.cisco.com/techsupport
>> Copyright (c) 1986-2008 by Cisco Systems, Inc.
>> Compiled Thu 01-May-08 02:31 by prod_rel_team
> Ok! There are two commands to disable it, since it's enabled by default!!!
>
> no ip nat service sip tcp port 5060
> no ip nat service sip udp port 5060
>
> I'll test it right now!
>>> Cheers,
>>> Daniel
>>>
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>
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