Under RFC 3263, if no NAPTR records are found the client constructs SRV queries for the transport protocols it supports.

Checked 2026-09-24

If no NAPTR records are found, the client constructs SRV queries for those transport protocols it supports
Vendor
IETF
Product
SIP
Subsystem
server location
Deployment
any
Region
not restricted
Release range
RFC 3263 (June 2002)
Checked
2026-09-24

Sources

Cite this note

APA

WarmTransfer. (2026, September 24). DNS SRV and service discovery for SIP: source note dns-srv-voice-rfc3263-no-naptr-srv-queries. WarmTransfer. https://warmtransfer.net/knowledge/claims/dns-srv-voice-rfc3263-no-naptr-srv-queries

BibTeX

@misc{warmtransfer-claim-dns-srv-voice-rfc3263-no-naptr-srv-queries,
  title  = {DNS SRV and service discovery for SIP: source note dns-srv-voice-rfc3263-no-naptr-srv-queries},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/claims/dns-srv-voice-rfc3263-no-naptr-srv-queries},
  note   = {Source note dns-srv-voice-rfc3263-no-naptr-srv-queries, checked 2026-09-24}
}

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