Which DNS record is required for SIP service discovery?

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Multiple Choice

Which DNS record is required for SIP service discovery?

Explanation:
DNS SRV records are what SIP clients use to locate the correct SIP service (such as a proxy or registrar) and the port to contact. The SRV mechanism lets the client query for a service like _sip._tcp or _sips._tcp at the domain, and the response includes which host to contact, the port, and priority/weight for load balancing and failover. A and AAAA records only map a hostname to an IP address and don’t indicate which SIP service to use or which port to reach. MX records are for email servers, not SIP. So, for SIP service discovery, DNS SRV records are required.

DNS SRV records are what SIP clients use to locate the correct SIP service (such as a proxy or registrar) and the port to contact. The SRV mechanism lets the client query for a service like _sip._tcp or _sips._tcp at the domain, and the response includes which host to contact, the port, and priority/weight for load balancing and failover. A and AAAA records only map a hostname to an IP address and don’t indicate which SIP service to use or which port to reach. MX records are for email servers, not SIP. So, for SIP service discovery, DNS SRV records are required.

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