On Fri, May 24, 2019, at 7:24 AM, Michael Maier wrote: > On 24.05.19 at 13:14 Joshua C. Colp wrote: > > On Fri, May 24, 2019, at 6:02 AM, Michael Maier wrote: > >> Hello! > >> > >> some people are facing a problem regarding forbidden outbound calls to > >> the ISP. They start an outbound call, which is rejected by the > >> provider. Debugging revealed the reason: The IP used for the outbound > >> INVITE is different from the IP used for the REGISTER. That's why the > >> ISP forbids the outbound call. > >> > >> > >> > >> Background: > >> > >> A SRV lookup gives 3 hosts each with different priority. At the start > >> time, Asterisk takes the IP with the highest priority for the > >> REGISTER. REGISTER timeout is 660s. > >> > >> Some time later, lets say 300s, an outbound call is started, which is > >> rejected by ISP (forbidden), because of wrong destination (REGISTER IP > >> != INVITE IP). > >> > >> My question: > >> Is it possible, that asterisk performs a DNS lookup before it sends the > >> INVITE to the ISP for the outgoing call? At this moment, the DNS > >> reports changed priorities or the REGISTERed IP isn't there at all any > >> more and therefore, Asterisk uses another IP for the outgoing INVITE? > > > > Yes, this is how it works. The outbound registration and calling aren't > > associated at all. When an INVITE is done then another resolution occurs > > along with picking an IP address. > > Unfortunately, this doesn't work, if the REGISTER to the existing old > IP isn't re-registered to the new IP before the INVITE is performed. > > I forgot to mention one more difficulty: There is more than one number > registered to the same destination which may have differing > reREGISTER point of times. > > Therefore, the process should be like this? > > - Outbound call is started > - DNS lookup is performed > - Check for difference of REGISTER IP (of this dedicated outgoing > number) and INVITE IP > -> Difference detected? Yes: > -> Stop REGISTER for this number (or leave it if there is an ongoing > call using this > number) > -> Start REGISTER for this number with new IP > - Start INVITE to new IP
There's nothing built in to do this, and honestly I'm not quite sure of the orchestration internally required to do such a thing. With code changes it may be possible but I don't even know if the foundations required are there. -- Joshua C. Colp Digium - A Sangoma Company | Senior Software Developer 445 Jan Davis Drive NW - Huntsville, AL 35806 - US Check us out at: www.digium.com & www.asterisk.org -- _____________________________________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-dev mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-dev
