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7. Practical DNS SRV Failover in SIP

Presented by Torrey Searle, Voxbone.

This session will explore how Voxbone operates a global VoIP backbone that was custom developed around SIPcompliant open source elements. One of the key contributing elements to the high availability of Voxbone's network is DNS SRV, a powerful tool for specifying load balancing and failover rules for SIP clusters. This session looks into how DNS SRV works in SIP and, more importantly, into the limitations in the current RFCs encountered over the years by implementing it. Finally, the session will propose a couple of improvements that could make fail-over even faster and more effective.