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Well, ideally each inbound caller’s endpoint uses the same implementation of DNS SRV as defined in RFC2782 and respects priorities and weights (my SIP SRV targets the edge cluster FQDN).
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<div>And to your point, I can reliably control the edge that accepts the initial inbound INVITE with SRV manipulation, but cannot reliably predict which control peer is used (though you can usually make a good guess).</div>
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<div>Ideally, I am trying to guarantee an active/passive use case in all scenarios, ingress and egress.<br>
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On Jan 23, 2019, at 16:32, Brian Meade <<a href="mailto:bmeade90@vt.edu">bmeade90@vt.edu</a>> wrote:<br>
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<div dir="ltr">Is this for inbound B2B or for MRA?
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<div>If inbound B2B, it's more up to the caller's implementation of DNS. If the caller is Webex, their may be some documented behavior out there somewhere.</div>
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<div dir="ltr" class="gmail_attr">On Wed, Jan 23, 2019 at 4:17 PM Ryan Huff <<a href="mailto:ryanhuff@outlook.com">ryanhuff@outlook.com</a>> wrote:<br>
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<div dir="auto">I’m trying to guarantee an active/passive use case; so maintenance mode would achieve that (or shutting one side down), but would require manual intervention, and be as clunky of a work-a-round as it gets for a runtime solution.<br>
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<div dir="ltr">-Ryan</div>
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On Jan 23, 2019, at 16:00, Lelio Fulgenzi <<a href="mailto:lelio@uoguelph.ca" target="_blank">lelio@uoguelph.ca</a>> wrote:<br>
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<div dir="ltr">I’m going to read the responses, but when I opened a TAC case, the engineer explained that there were at least two selection processes in play, which C (or E) to pick, then which neighbour to pick for the traversal.
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<div>She said, if you want to be 100% sure during troubleshooting, that you are testing a particular path, you want to put the nodes you don’t want to use into maintenance mode. </div>
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<div>Made sense to me at the time. <br>
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On Jan 23, 2019, at 3:19 PM, Ryan Huff <<a href="mailto:ryanhuff@outlook.com" target="_blank">ryanhuff@outlook.com</a>> wrote:<br>
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<div><span>Can anyone explain or cite the documents that define the algorithm used to determine which Expressway node in a given cluster is selected to process a call.</span><br>
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<span>You can influence the selection with DNS SRV priority and weight, but does not appear to guarantee which cluster node is selected each time.</span><br>
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<span>Thanks,</span><br>
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<span>Ryan</span><br>
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