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Inbox Theory

DNS

SRV Lookup

Resolves SRV records — the host, port, priority, and weight advertised for a specific service (e.g. `_sip._tcp.example.com`).

Advertises the host and port for a specific service (e.g. SIP, XMPP) rather than a whole domain.

Clients for services that support SRV discovery use this instead of a hardcoded host/port — get the priority/weight/port wrong and that service becomes undiscoverable.