Dear Mojtaba thanks for your kind response ...

As you mentions, Your isuue is in control-plan (signalling in IMS),Then it is not regards of NAT issue.

i though it caused by NAT at the begging but Yes it's only affect on Control plan .

Please check your network again. also check mediation devices between p-cscf and user2's device, so that why the user2 doesn’t receive

I>NVITE signalling. there is a firewall and router between the users and the proxy , after making a lot of tests i found that when the Ue receive the invite sip message and start ringing there is no 180 ringing and 200 ok messages arrived to the proxy and the second user doesn't know if the call success :\ in another word:

ue1 ------------invite----------->proxy--------invite------->ue2 ue1 <-------------trying -----------proxy <-------------trying ----ue2 and there is no 180 ringing ,200 ok message sent from the ue2 to the proxy .

so how could i solve this issue ? many thanks and regards ________________________________ From: sr-users sr-users-bounces@lists.kamailio.org on behalf of Mojtaba mespio@gmail.com Sent: Saturday, August 11, 2018 5:54 AM To: Kamailio (SER) - Users Mailing List Subject: Re: [SR-Users] Nat issue

Hello eyas, The NAT issue in IMS (and VoIP) solution networks, is affected to user-plan (e.g Voice) only. In this regards, you maybe have no-way audio or one-way audio. As you mentions, Your isuue is in control-plan (signalling in IMS), Then it is not regards of NAT issue. Please check your network again. also check mediation devices between p-cscf and user2's device, so that why the user2 doesn’t receive INVITE signalling. Do you could use Multi-Homed in p-cscf or not? With Regards.Mojtaba

On Thu, Aug 9, 2018 at 1:11 AM, eyas barhouk eyas37@hotmail.com wrote:

hello dears

when i'm using kamailio 5.2 as IMS i'm facing the following NAT issue :

when p-cscf handle a call from user1 to user2 that pre-registered on private address "192.X.X.X" (on another LAN) the user can't receive the invite message .

in another word: proxy ip : 10.192.X.X user1 ip : 10.X.X.X user2 ip : 192.X.X.X the call scenario : user1 ---invite----> user2 (not arrived)

when p-cscf handle a call from user2 that pre-registered on private IP "192.X.X.X" (on another LAN) to user1 the user receive the invite message .

the call scenario : user2 ---invite----> user1 (arrived)

when both of the user on different LANs the message 200 OK doesn't arrive to proxy :\

so based on that does any one has an experiment with NAT handling & nathelper module and how to configure it on P-cscf .

thanks in advance

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Kamailio (SER) - Users Mailing List sr-users@lists.kamailio.org https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users

-- --Mojtaba Esfandiari.S

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