I've thought a lot about this as well, although I haven't taken it nearly as far as John has.
A thought: is it possible to do a save() in the reply route, only upon a 200 OK from the end registrar? - Jeff On 5/12/09 5:09 AM, "Bogdan-Andrei Iancu" <bog...@voice-system.ro> wrote: > Hi John, > > This mid-registrar approach may work but it is not 100% correct as > OpenSIPS (as mid-registrar) does not obey the actions of the final > registrar (Asterisk). Ex: > - Asterisk may forbid the registration and you already saved the > registration on OpenSIPS > - Asterisk may change the Expire time while to saved the > registration with the expire sent by client. > > Anyhow, ignoring this aspects, lets go further :) : > > 1) is the registration scenario working ok? if not what is the exact > problem (some trace will help). > > I will wait for you answer before moving further with the calling stuff. > > Regards, > Bogdan > > John Morris wrote: >> After several days of playing with OpenSIPS 1.5.0 and RTPProxy 1.2.0, I >> have a partially working SIP+RTP ALG configuration, and have gotten stuck. >> I could use some general advice from the list. >> >> The company has an Asterisk/FreePBX server on an internal network, and the >> CEO wants to use a SIP phone from outside. Because the sip alg iptables >> module isn't working, and in preparation for another project, I started >> investigating OpenSIPS for use as a border proxy to connect phones across >> NAT (and, the next project, to route a SIP trunk over a VPN from the >> network of a DSL+phone company that intermittently blocks SIP traffic in >> hopes of plugging revenue leaks). >> >> The network looks like this: >> >> SIP UA <-> home NAT gateway <-> Internet <-> OpenSIPS server/NAT router >> <-> Asterisk >> >> The standard opensips.cfg file doesn't work as is. The SIP phone needs to >> register to the Asterisk server directly. In addition, it seems there is >> extra logic needed to support multiple network interfaces (mhomed=1 only >> partially solves the problem). >> >> The way I've gone with this in testing is to relay REGISTERs to Asterisk, >> but after a save("location","0x02") to enable a lookup("location") on >> messages originating from the PBX. The phone is configured with an >> outbound proxy, and all packets to the proxy matching "uri==myself" are >> thrown away. This worked great on the single-interfaced, internal test >> installation. Now that there are multiple interfaces involved, things are >> breaking again; ACKs and BYEs are sent out the wrong interface, and >> RTPProxy is behaving strangely in bridged mode. >> >> There seem to be no good configuration examples for either multi-homed >> proxies or for proxies that relay REGISTERs. This makes me think that I'm >> going about this the wrong way. >> >> Also, I have looked at other software, like siproxd, opensbc and uh, that >> other b2bua that functions as an SBC, but none of those seem to allow this >> REGISTER pass-through function. >> >> What is the best approach for this scenario? The above approach of >> relaying REGISTERs to Asterisk? Is there maybe another approach where >> phones register to OpenSIPS directly, and OpenSIPS in turn somehow sends >> another REGISTER to Asterisk? Or am I missing the idea completely? >> >> I'd appreciate general pointers about how to proceed. I've been putting >> some Asterisk and FreePBX tutorials and CentOS RPMs on >> http://www.zultron.com, mostly aimed at small office-like environments. >> Looking through various lists, this seems a highly sought-after >> configuration. If I succeed, I'll document it in hopes of filling the gap >> in this sort of example. >> >> Thanks >> >> John >> >> >> _______________________________________________ >> Users mailing list >> Users@lists.opensips.org >> http://lists.opensips.org/cgi-bin/mailman/listinfo/users >> >> > > > _______________________________________________ > Users mailing list > Users@lists.opensips.org > http://lists.opensips.org/cgi-bin/mailman/listinfo/users _______________________________________________ Users mailing list Users@lists.opensips.org http://lists.opensips.org/cgi-bin/mailman/listinfo/users