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

Thu May 14 21:46:48 CEST 2020

You could simply compile rtpproxy

What I mean about the SDP is the connection parameter, something along the
lines of:

c=IN IP4 X.X.X.X

Where X.X.X.X is the up where the receiver must send its rtp. It must be
reachable from the receiver.

On Thu, 14 May 2020 at 19:10, Pavithra Mohanraja <pavimohan3004 at gmail.com>
wrote:

> 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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>>>>>>>>>>>>>
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-- 
Regards,

David Villasmil
email: david.villasmil.work at gmail.com
phone: +34669448337
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