On Tue, Feb 19, 2013 at 10:37 AM, Hegner, Travis <theg...@trilliumit.com> wrote: > Hi All, > > I am working on a kamailio proxy with a very specific goal I need to > accomplish. > > What I would like to do is a key-value lookup, utilizing the SDP’s media > contact (c= line) IP as a key, and have a function return a value for that > key. It appears that I can possibly accomplish this with the AVPops module, > combined with DB_TEXT (maybe DB_MYSQL in the future) and a custom table with > a custom query. The only thing I seem to be missing is the ability to > extract the c= IP from the SDP, and store it as some kind of variable with > which to do the lookup. > > I’ve looked into the iptrtpproxy module as it seems to have a select: > @iptrtpproxy.sdp_ip that could work, but that module is extreme overkill for > my purposes, and I am running into some issues getting it built for my > platform (Ubuntu server 12.04). Also the documentation for that select > states: “Return first rewritten IP provided at SDP c= line.” However, I’m > looking for the original sdp_ip, and have some concern that this won’t > return an IP that has not yet been re-written. > > My environment has a very specific 1:1 ratio of private network, to static > public IP mappings. I currently have a successful OpenSER (1.3.2) deployment > within this environment (running 5 years), which uses a hacked version of > the old “mangler” module, with the function sdp_mangle_ip(<network>, <ip>). > I could do something similar using textops->search_body() and > nathelper->fix_nated_sdp(), but the risk of a typo or syntax error in the > config file every time I have to make a change or add a network is fairly > high. Less importantly, there is some extra overhead as the proxy will have > to test for every network on every SDP looking for a match (this is what the > current deployment does). Eventually I’d like to add a simple frontend to > add/edit networks on the fly, so that no one is ever touching the config. > > What would you folks recommend for this? Should I look at building a custom > module which only grabs the c= IP and stores it into an AVP? Am I not seeing > another module that will expose that information for me already? Would it > simply be easier to work on getting iptrtpproxy built, and utilizing it only > for the purpose of extracting the information I need from the SDP?
There is the sdpops module: http://kamailio.org/docs/modules/devel/modules/sdpops.html You could create a patch to add some AVPs to export the media streams with it's params. Take a look at the sdp parser (check print_sdp_session as an example of what's already available) Please note that an AVP can store multiple values (but it cannot have holes in between the values). Also, a new class of transformations dedicated to SDP would be handy (combined with the above AVPs). http://www.kamailio.org/wiki/cookbooks/devel/transformations Regards, Ovidiu Sas -- VoIP Embedded, Inc. http://www.voipembedded.com _______________________________________________ SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list sr-users@lists.sip-router.org http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
