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@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 > Cheers, > Daniel > _______________________________________________ SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list sr-users@lists.sip-router.org http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
