Hello, On 03/11/14 10:43, Marko Seidenglanz wrote: > Hello, > > We are using Kamailio 4.2 and RTPEngine 3.3 hosted on a VM behind NAT > in Google Cloud Engine. > > Asterisk 11 + Kamailio + RTPEngine are on the same machine and > Kamailio is used as WebRTC Gateway. > > INVITES, that are rewritten by Kamailio look like the following: > > INVITE sip:etden7konsdmvcunyi...@wh2.24dial.com > <mailto:sip%3aetden7konsdmvcunyi...@wh2.24dial.com> SIP/2.0 > Record-Route: <sip:0.0.0.0:5064;lr=on;nat=yes> > Via: SIP/2.0/UDP > 0.0.0.0:5064;branch=z9hG4bK86f5.88fb7f8810c91758b5f3962420d3a4ef.0 > Via: SIP/2.0/UDP > 10.240.1.95:5060;received=127.0.0.1;branch=z9hG4bK05952ee6;rport=5060 > Max-Forwards: 69 > From: "Anonymous" <sip:anonymous@anonymous.invalid>;tag=as7900b63f > To: <sip:etden7konsdmvcunyi...@wh2.24dial.com > <mailto:sip%3aetden7konsdmvcunyi...@wh2.24dial.com>> > Contact: <sip:anonymous@10.240.1.95:5060;alias=127.0.0.1~5060~1> > Call-ID: 0662d336694c60ed60ed5310571a1aee@10.240.1.95:5060 > <http://0662d336694c60ed60ed5310571a1aee@10.240.1.95:5060> > CSeq: 102 INVITE > User-Agent: Asterisk PBX 11.13.1 > Date: Mon, 03 Nov 2014 09:01:39 GMT > Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, > INFO, PUBLISH, MESSAGE > Supported: replaces, timer > Content-Type: application/sdp > Content-Length: 676 > P-hint: outbound > > > As you can see, Kamailio uses 0.0.0.0 for Record-Route as well as for > VIA Header. > It uses the address configured in kamilio.cfg (listen=udp:0.0.0.0:5064 > <http://0.0.0.0:5064>) > > I know, that we could use the advertise parameter to tell kamailio the > external IP. The problem is, that IPs in GCE are dynamically assigned > to the VMs. Thus static configuration of external IP is not sufficient > for our setup. > > Is there a way, to let Kamailio gather it's external IP dynamically. > (E.g. using a STUN server or something like that?) > > Another possibility would be to tell Kamailio it's external IP via a > start parameter. Is that possible?
you can give the advertised address as part of the listen parameter: listen=udp:localip:port advertise publicip:port You can define tokens in kamailio configuration file via command line parameter -A (see kamailio -h). Cheers, Daniel -- Daniel-Constantin Mierla http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda Kamailio Advanced Training, Nov 24-27, Berlin - http://www.asipto.com
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