All of my clients are behind NAT! Unfortunately I can not put my captures here. The strange thing here for me is that:

1- Desktop can always REGISTER with all of my usernames.

2- My android phones can REGISTER with some usernames! For example if I have a 12 and a 17 username Android Linphone can REGISTER with 12 but not with 17. Kamailio will always return a 401 error. This thing only happens on Android Linphone.

I captured packets for both scenarios but nothing is strange about packets! How is this even possible?!!

On Fri, Feb 5, 2016 at 1:25 PM, Daniel-Constantin Mierla <miconda@gmail.com> wrote:

Hello,

received and rport are added when the client is behind NAT. Can you paste here the capture for the case that doesn't work? It will help us to see what is wrong there, and if not, could be that the mobile operator does some SIP ALG which breaks/blocks the sip, in this case you have to switch to tls.

Cheers,
Daniel

On 05/02/16 07:35, Gholamreza Sabery wrote:
I am using Kamailio 4.1.x with NAT enabled. When I want to REGISTER using my desktop client which is Linphone everything is find with any username. But on Android some users can REGISTER and someusers can not. I captured SIP packets and the only difference between packets on Android devices and packets on Desktop client is that on my desktop "received" and "rport" are not added by Kamailio in response messages. Any idea on what is happening here?
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