[SR-Users] Kamailio-5.3.3. NAT and RTP not working

Thu May 14 19:56:15 CEST 2020

Hi supreeth,

You have mentioned about rtpengine aswellas rrpproxy in open5g
documentation .

The same procedure only I have followed for rtpproxy. And one more thing ,
I have tried installing rtpengine but libraries are based on Ubuntu bionic
. But I am using ubuntu xenial. So libraries are not getting installed
properly .

Did everything worked fine for you when you tried with rtpproxy for this
version (5.3.3)?

On Thu, May 14, 2020, 9:59 PM supreeth herle <herlesupreeth at gmail.com>
wrote:

> Hello Pavithra,
>
> I have written a guide for how to integrate an IMS using Kamailio with
> open5gs EPC, here is the link
> https://open5gs.org/open5gs/docs/tutorial/02-VoLTE-setup/. You can find
> steps to setup rtpengine in that guide.
>
> Regarding requirement of rtpengine, its mandatory if you want to use the
> scripts in that example folder without modification. Also, read the READE
> of sipwise/rtpengine github repo, its very informative (in a gist rtpengine
> offer much more feature than rtpproxy)
>
> why can't we have sip client to sip client rtps flowing like how it is
>> happening without NAT.
>>
>
> For this, i would definitely suggest to read about SIP working. This is a
> perfect link https://github.com/onmyway133/blog/issues/284 which offers
> extensive material (short and very interesting to read with examples)
> related to SIP.
>
> Best Regards,
> Supreeth
>
>
> On Thu, 14 May 2020 at 17:51, Pavithra Mohanraja <pavimohan3004 at gmail.com>
> wrote:
>
>> Hi ,
>>
>> I didn't configure rtpengine ..instead of that only I used rrpproxy..will
>> it not work?
>>
>> If not please tell me how to configure rtpengine and also tell me if it
>> is really madatory .. why can't we have sip client to sip client rtps
>> flowing like how it is happening without NAT.
>>
>> That's my doubt ..please clarify ..
>>
>> Thanks.
>>
>> On Thu, May 14, 2020, 8:57 PM supreeth herle <herlesupreeth at gmail.com>
>> wrote:
>>
>>> HI,
>>>
>>> Hold on a moment,
>>>
>>>
>>>> 10.40.10.3 - pcscf in port 4060 (pcscf with NAT enabled in pcscf.cfg
>>>> (!#define WITH_NAT) and configured rtpproxy)
>>>> 10.40.10.12 - icscf in port 4070
>>>> 10.40.10.5 - scscf in port 4080
>>>> 10.40.10.30 - hss
>>>>
>>>
>>> So i assume you are using the examples provided in the ims folder of
>>> kamailio repo right? Isn't it using RTPEngine and not RTPProxy? Or have you
>>> modified the P-CSCF configuration to work with RTPProxy?
>>>
>>> Best regards,
>>> Supreeth
>>>
>>> On Thu, 14 May 2020 at 16:39, Pavithra Mohanraja <
>>> pavimohan3004 at gmail.com> wrote:
>>>
>>>> Hi ,
>>>> I have attached working rtp pcap file. But it is getting reverted back
>>>> to me .
>>>>
>>>> As you said , i have tried restarting rtpproxy several times. but it
>>>> didnt work .
>>>>
>>>>
>>>>
>>>> On Thu, May 14, 2020 at 7:11 PM supreeth herle <herlesupreeth at gmail.com>
>>>> wrote:
>>>>
>>>>> Thanks for the pcap. Sorry, to ask this but can you also send pcap of
>>>>> scenario where you see RTP packets?
>>>>>
>>>>> Also, did you restart the rtpproxy after altering the
>>>>> /etc/default/rtpproxy ?
>>>>>
>>>>> i.e.
>>>>>
>>>>> $ systemctl restart rtpproxy
>>>>>
>>>>> Best Regards,
>>>>> Supreeth
>>>>>
>>>>> On Thu, 14 May 2020 at 14:51, Pavithra Mohanraja <
>>>>> pavimohan3004 at gmail.com> wrote:
>>>>>
>>>>>> Hi Supreeth,
>>>>>> I have attached pcap files . kindly check and let me know.
>>>>>> filter of rtp packets and check.
>>>>>>
>>>>>> *filter : sip || rtp*
>>>>>>
>>>>>>
>>>>>> On Thu, May 14, 2020 at 5:15 PM supreeth herle <
>>>>>> herlesupreeth at gmail.com> wrote:
>>>>>>
>>>>>>> Hi Pavithra,
>>>>>>>
>>>>>>> Thanks for the clarification. Can you please attach a pcap of the
>>>>>>> call where you are not seeing the RTP packets? And, btw is the call getting
>>>>>>> dropped or something in that scenario?
>>>>>>>
>>>>>>> Regards,
>>>>>>> Supreeth
>>>>>>>
>>>>>>>
>>>>>>> On Thu, 14 May 2020 at 13:34, Pavithra Mohanraja <
>>>>>>> pavimohan3004 at gmail.com> wrote:
>>>>>>>
>>>>>>>> Hi Supreeth,
>>>>>>>>
>>>>>>>> I have kamailio ims installed in 4 vms inside openstack.
>>>>>>>>
>>>>>>>> 10.40.10.3 - pcscf in port 4060 (pcscf with NAT enabled in
>>>>>>>> pcscf.cfg (!#define WITH_NAT) and configured rtpproxy)
>>>>>>>> 10.40.10.12 - icscf in port 4070
>>>>>>>> 10.40.10.5 - scscf in port 4080
>>>>>>>> 10.40.10.30 - hss
>>>>>>>>
>>>>>>>> so all these vms are running in same subnet.
>>>>>>>> I have a floating ip associated to pcscf.
>>>>>>>> Now I have two zoiper clients outside openstack
>>>>>>>> zoiper1 - 10.0.2.15 (NAT Enabled Network adaptor)
>>>>>>>> zoiper2 - 10.0.2.15
>>>>>>>>
>>>>>>>> when i am making a call from zoiper1 to zoiper2, call is going
>>>>>>>> properly . SIP messages are coming properly in wireshark packets.
>>>>>>>> when i filter for RTP packets in wireshark,  it is not coming.
>>>>>>>>
>>>>>>>>
>>>>>>>> when i have the zoiper clients inside openstack itself ,i can able
>>>>>>>> to see RTP Packets in wireshark between two sip clients without any NAT
>>>>>>>> related configurations done.
>>>>>>>>
>>>>>>>> Kindly help me.
>>>>>>>> Thanks.
>>>>>>>>
>>>>>>>> On Thu, May 14, 2020 at 4:49 PM supreeth herle <
>>>>>>>> herlesupreeth at gmail.com> wrote:
>>>>>>>>
>>>>>>>>> Can you explain some more when you mean by "RTP alone is not
>>>>>>>>> coming."? And, how are you checking/verifying that?
>>>>>>>>>
>>>>>>>>> Regards,
>>>>>>>>> Supreeth
>>>>>>>>>
>>>>>>>>> On Thu, 14 May 2020 at 13:12, Pavithra Mohanraja <
>>>>>>>>> pavimohan3004 at gmail.com> wrote:
>>>>>>>>>
>>>>>>>>>> Hi ,
>>>>>>>>>>
>>>>>>>>>> Yes I have configured as you mentioned only . In my pcscf only i
>>>>>>>>>> have rtpproxy also configured.
>>>>>>>>>> Floating IP i have given in listen address also as
>>>>>>>>>> listen = 10.40.10.3:4060 advertise 10.45.4.22:4060
>>>>>>>>>>
>>>>>>>>>> 10.40.10.3 - private ip
>>>>>>>>>> 10.45.4.22 - floating ip
>>>>>>>>>> Still RTP alone is not coming.
>>>>>>>>>>
>>>>>>>>>> Is it the only way of configuring NAT ?
>>>>>>>>>>
>>>>>>>>>> Thanks.
>>>>>>>>>>
>>>>>>>>>> On Thu, May 14, 2020 at 4:37 PM supreeth herle <
>>>>>>>>>> herlesupreeth at gmail.com> wrote:
>>>>>>>>>>
>>>>>>>>>>> Hello Pavithra,
>>>>>>>>>>>
>>>>>>>>>>> Have you tried advertising the floating IP of the VM running
>>>>>>>>>>> RTPProxy as follows?
>>>>>>>>>>>
>>>>>>>>>>> Edit /etc/default/rtpproxy file as follows:
>>>>>>>>>>>
>>>>>>>>>>> # Additional options that are passed to the daemon.
>>>>>>>>>>> EXTRA_OPTS="-l 172.24.15.30 -d DBUG:LOG_LOCAL0"
>>>>>>>>>>>
>>>>>>>>>>> here, "-l <PUBLIC_IP>"
>>>>>>>>>>>
>>>>>>>>>>> Hope it helps.
>>>>>>>>>>>
>>>>>>>>>>> Regards,
>>>>>>>>>>> Supreeth
>>>>>>>>>>>
>>>>>>>>>>> On Thu, 14 May 2020 at 13:01, Pavithra Mohanraja <
>>>>>>>>>>> pavimohan3004 at gmail.com> wrote:
>>>>>>>>>>>
>>>>>>>>>>>> Hi ,
>>>>>>>>>>>>
>>>>>>>>>>>> Could anybody please give me the approach how to configure NAT
>>>>>>>>>>>> in kamailio IMS.
>>>>>>>>>>>>
>>>>>>>>>>>> I have installed kamailio IMS in openstack environment which
>>>>>>>>>>>> has private ips for all four vms (each component in one vm). pcscf has one
>>>>>>>>>>>> floating IP attached. I have enabled "WITH_NAT" and configured rtpproxy .
>>>>>>>>>>>>
>>>>>>>>>>>> when i make a call from outside of openstack using 2 zoiper
>>>>>>>>>>>> clients with outbound proxy keeping floating ip of pcscf, I am getting 200
>>>>>>>>>>>> ok with all SIP packets correctly flowing but there is no RTP Packet.
>>>>>>>>>>>>
>>>>>>>>>>>> When i try the same within openstack environment without using
>>>>>>>>>>>> public ip, I am getting RTP Packets.
>>>>>>>>>>>>
>>>>>>>>>>>> Kindly tell me the procedure of NAT Enablement or do i need to
>>>>>>>>>>>> do anything other than this.
>>>>>>>>>>>>
>>>>>>>>>>>> Kindly help because i am stuck with this for long time.
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>> Thanks.
>>>>>>>>>>>> _______________________________________________
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