Thanks for the tip! Q On Mon, Mar 5, 2018, 3:58 PM Loren Hillukka <lchillu...@hotmail.com> wrote:
> 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 >
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