Nice tips Adam. The failovers to active endpoints was a pain. That retry invites 2 was a must - the default was 6.
Loren > On Mar 5, 2018, at 1:14 PM, Pawlowski, Adam <aj...@buffalo.edu> wrote: > > Ed, > > Caveat on all this that I set this up a year or two ago so I could be wrong > on some parts: > > This does DNS SRV lookup I believe first, then A. As long as you're in an IOS > version that supports SRV as that appeared somewhere in 15 I believe. We are > running 15.(4)3 M2. > > I set up a number of SRV records to point at my UCM cluster, for example, and > then have the dial-peer set to: > > session target dns:prod-all.cmgroup.subzone.zone.internal > > I don't see that I have specified "session transport tcp" in this router but > this is a _SIP._TCP SRV record and it is up and running. > > I will say that you want to be careful with using this with the > busyout/options ping. In my experience when it pulls the various SRV hosts, > with respect to preference and weight, it will pick the one it should be > using at any given point in time but it will not test all UCM nodes. It could > be possible to busyout the group if multiple failures were to occur for some > reason, even if other hosts are up, based on how IOS handles the responses to > this. I sort of recall watching it, and test #1 may go to subA which fails, > but then test #2 goes to subB so you're good. If you'd set the weighting > different you could knock the peer offline. > > I think. > > I know that in response to this behavior I did add this configuration to my > sip user agent configuration: > > sip-ua > retry invite 2 > timers trying 100 > ! > > This was to cause the router to try again (perhaps to a different peer) if it > failed to get anywhere with one. The defaults were too long for the call to > fail out to a particular peer before exceeding network timers and losing the > call. > > Best, > > Adam Pawlowski > SUNYAB NCS > > _______________________________________________ > cisco-voip mailing list > cisco-voip@puck.nether.net > https://puck.nether.net/mailman/listinfo/cisco-voip _______________________________________________ cisco-voip mailing list cisco-voip@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-voip
