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Re: [SR-Users] Kamailio + rtpproxy talking to multiple carrier gateways
by Sarat C. Vemuri 06 Sep '11

06 Sep '11

Again, I apologize for this clumsy way of replying. Ovidiu, Thanks for the pointer on set_advertised_address. I had to patch rtpproxy module (and rr module for the two parameters to request_route_preset) since I am running 3.1. However, I still have a problem with ACKs after following what you suggested. INVITE from Internal to Carrier routes properly (two Request-Route headers, one internal IP and other public IP). On 200 OK, the carrier GW properly copies the route set in to Route … [View More]header. Now the route contains two entries, the public IP and the private IP of Kamailio. The Internal UAC then sends the ACK back to Kamailio. Everything is fine till this point. Now, Kamailio removes the top entry, which is the private IP and then promptly sends the ACK to the public IP of itself!. Of course, that doesn't go anywhere. How do I remove the "public IP" entry from the route set before forwarding the reply to Internal UAC? Is there another way to deal with this? I've tried to set an alias= core parameter with the public IP, but doesn't seem to have any effect. The public IP is not reachable from internal network. Thanks for your help SV. ------------------------------ Message: 3 Date: Sat, 3 Sep 2011 16:44:22 -0700 From: Ovidiu Sas <osas(a)voipembedded.com> Subject: Re: [SR-Users] Kamailio + rtpproxy talking to multiple carrier gateways - some via Firewall/NAT To: "SIP Router - Kamailio (OpenSER) and SIP Express Router (SER) - Users Mailing List" <sr-users(a)lists.sip-router.org> Message-ID: <CAND0Lkt_dpcTm2WKMywMhX6rdsX1ia0r=LYrzB1WfX3oN32Wrg(a)mail.gmail.com> Content-Type: text/plain; charset=windows-1252 It is feasable to what you want: kamailio behind NAT proxying traffic from/to public internet to/from private network. You will need to properly craft the INVITE and use proper record route headers. Use set_advertised_address when needed: http://kamailio.org/dokuwiki/doku.php/core-cookbook:3.1.x#set_advertised_ad… Also, use record_route_preset (note that there are two parameters): http://kamailio.org/docs/modules/devel/modules_k/rr.html#id2547566 That should do it. You don't need any patches for rtpproxy. Just use force_rtpp_proxy (and force the IP address): http://kamailio.org/docs/modules/devel/modules/rtpproxy.html#id2546034 Note: Make sure that you understand how in-dialog requests are routed by a proxy in order to know how to properly handle the initial INVITE. Regards, Ovidiu Sas On Sat, Sep 3, 2011 at 2:53 PM, Sarat C. Vemuri <sarat.vemuri(a)fthco.com> wrote: > We are trying to configure Kamailio ?(3.1.x) as a ?boarder proxy? where it > acts as the front for various carrier gateways so that internal UACs and > UASs are unaware of the carrier gateways. > > > > Let me try to present a clear picture of our setup. > > 1.?????? Kamailio has several NICs (physical or vlan).? Each on a different > subnet. One subnet is internal/has routes for internal.? Other subnets are > private connections to carriers or a ?route to public Internet. > > 2.?????? All of these subnets are non-routable from Internet. In addition , > the carrier private connections are not routable internally. > > 3.?????? Connection to public internet is via a FW/NAT (one-to-one NAT), > which maps to one of the interfaces. > > 4.?????? All internal? UAC/UAS connect on the internal subnet. > > 5.?????? We are using RTPProxy? (at least one instance per carrier) to relay > media between internal and carrier subnets > > > > We are able to make this setup up work great except for one scenario.? One > of the carriers is only reachable via public Internet.? Due to security > requirements, our Kamailio cannot have a public IP address and must use > FW/NAT. I guess this scenario is ??Proxy behind NAT? and not really > encouraged. But I would like to see if there is a way to make this work.? We > cannot use the ?advertised_address? since it changes the IP for every > ?route?. > > > > We were able to get this mostly ?working by doing the following > > 1.?????? mhomed=1 > > 2.?????? Small patch in the rtpproxy module so that ?force_rtp_proxy > actually uses the IP address passed (public IP). > > 3.?????? Using request_route_preset(?publicIP?) > > > > The above ?mostly? works.? By that I mean, the INVITE transaction is > properly passed between internal UAS and carrier SBC and the call is setup. > However, further transactions (BYE/re-INVITE) etc do not work properly. So, > far-end hangups are not ?working etc. > > > > I?ve searched various archives of this and other SER lists looking to see if > anyone was able to get this scenario working, but couldn?t find a definitive > answer.? Most of them point to using ?advertised_address?. > > > > So, and ideas on how to make ?Proxy behind NAT? work without using > advertised_address?? Am I wasting my time? > > > > Thanks in advance for any help you can offer. > > > > SV. > > > > _______________________________________________ > SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list > sr-users(a)lists.sip-router.org > http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users > > [View Less]

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KAMAILIO RTP PROXY
by Phillman25 Kyriacou 06 Sep '11

06 Sep '11

Hi I want to use Kamailio to handle both signalling and media always. My scenario is the following PSTN==>KAMAILIO==>ASTERISK. I have a dialplan that points to ASTERISK when a call comes into Kamailio. Signalling is fine, however i cant seem to get the Media to work, i have installed the RTPPROXY as suggested by RTPPROXY module and have implemented it into the routing logic, however i have one way audio. The PSTN side cannot hear anything. I dont use the Kamailio for sip registrations … [View More]

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db_mysql "Commands out of sync; you can't run this command now "
by MÉSZÁROS Mihály 06 Sep '11

06 Sep '11

Hi, I am using the git version of kamailio, and i am experiencing problem This message is repeated in log with all kind of mysql query (insert/delete/select) Aug 27 22:04:05 hal /usr/sbin/kamailio[25681]: ERROR: db_mysql [km_dbase.c:124]: driver error on query: Commands out of sync; you can't run this command now Aug 27 22:04:05 hal /usr/sbin/kamailio[25681]: ERROR: <core> [db_query.c:103]: error while submitting query Aug 27 22:04:05 hal /usr/sbin/kamailio[25681]: ERROR: usrloc [… [View More]

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Re: [SR-Users] Kamailio + rtpproxy talking to multiple carrier gateways
by Sarat C. Vemuri 05 Sep '11

05 Sep '11

Alex, Sorry about this clumsy way of replying, but I am stuck with Outlook 2010 and Exchange. You stated the problem correctly. Carrier GWs (UAS) and internal clients (UAC) cannot reach each other directly (TCP/UDP). They have to go through Kamailio and rtpproxy. I am goint to reply to Ovidiu as well with some more details. Thanks SV. ------------------------------ Message: 2 Date: Sat, 03 Sep 2011 19:12:38 -0400 From: Alex Balashov <abalashov(a)evaristesys.com> Subject: Re: [SR-… [View More]

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SIP Analysis & Testing tools
by Vladimir Broz 05 Sep '11

05 Sep '11

Hi, for sake of Vaclav's courage, let me introduce the "SIP Analysis & Testing tools". This is a set of very powerful utilities that may help you to do SIP call flows analysis. It can do SIP dialogs and transactions matching and analysis in large pcaps, create pretty call flow diagrams, check and verify SIP message content (headers, parameters,..) and many more.... It's available on: https://github.com/vkubart/sipat For more details, please ask Vaclav Kubart (vaclav.kubart(a)iptel.… [View More]

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question
by Allen D. Ford 05 Sep '11

05 Sep '11

Where are the instructions for this gui Im trying to setup a sip load balancer and rtp proxy for nating "Success is not measured by the positions you reach in life but by the obstacles you overcome -B.T.W" [Description: Description: Description: Description: Description: cyford]<http://www.cyfordtechnologies.com/>Director Of Technology Allen D. Ford 4290-106 Bells Ferry Road, Suite 20 , Kennesaw , GA 30144 Tel: 404-424-8270: Fax: 404-424-8271 Email: allen(a)cyfordtechnologies.com&… [View More]

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10 Years SER - Awards
by Daniel-Constantin Mierla 05 Sep '11

05 Sep '11

Hello, a surprise part of 10 Years SER Conference was granting *special* awards to the people attending the event that had a major contribution in the management and development of SER/Kamailio to date. Most of them are well known in the community, but not all of them. Hope you like them, it proved to be a very entertaining moment. Here is the pdf with the awards: * http://asipto.com/u/48 The plan is to extend it with the other people in our community as ideas with award titles pop … [View More]

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10 Years SER - Follow UP
by Daniel-Constantin Mierla 05 Sep '11

05 Sep '11

Hello, first I want to thank to all participants at 10 Years SER event in Berlin last Friday. We spent great time, at least I did! We accepted 50 visiting participants to match the maximum capacity of the conference room, being full booked about 2 weeks before. Just few people didn't show up and didn't inform us at all in advance, which was a pity over all since several persons that registered later were not accepted, thus some of them could have attended. Folks at Fokus working with … [View More]

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tls + tcp problems
by MÉSZÁROS Mihály 05 Sep '11

05 Sep '11

Hi, I am experiencing two problem: First: I am experiencing that tls read buffer overflow, if i use default value of tcp_rd_buf_size If i doubled the size of read buffer and i use tcp_rd_buf_size=8192 then the problem seems to be solved. Second: I am experiencing that TLS connection is dropped by sip proxy very frequently! And i think the tcp connection shouldn't dropped! So my guess is that TLS communication is not restarting the timeout counters! So in every 2 minutes the sip-… [View More]

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Carrier module for kamailio
by Mino Haluz 05 Sep '11

05 Sep '11

Hi, I need a module which could allow me to send traffic to various carriers and it has to support some important features. So some basic ones: - possibility to re-route the call in case the original route fails - peak/offpeak conditions (time-based) - route traffic according to prefix I found LCR and carrierroute module, but it does not have peak/offpeak feature. Correct me if I am wrong..

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