Source note · DNS SRV and service discovery for SIP
RFC 3263 has a SIP client resolving a domain-name target try NAPTR records first, then SRV records if no NAPTR records exist, then an A or AAAA lookup if no SRV records exist.
Checked 2026-09-24
- Vendor
- IETF
- Product
- SIP
- Subsystem
- server location
- Deployment
- any
- Region
- not restricted
- Release range
- RFC 3263 (June 2002)
- Checked
- 2026-09-24
Sources
- RFC 3263: Session Initiation Protocol (SIP): Locating SIP Servers — RFC Editor / IETF · tier 1 standards and regulators · Section 4.1 Selecting a Transport Protocol; Section 4.2 Determining Port and IP Address
Cite this note
APA
WarmTransfer. (2026, September 24). DNS SRV and service discovery for SIP: source note dns-srv-voice-rfc3263-procedure-order. WarmTransfer. https://warmtransfer.net/knowledge/claims/dns-srv-voice-rfc3263-procedure-order
BibTeX
@misc{warmtransfer-claim-dns-srv-voice-rfc3263-procedure-order,
title = {DNS SRV and service discovery for SIP: source note dns-srv-voice-rfc3263-procedure-order},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/dns-srv-voice-rfc3263-procedure-order},
note = {Source note dns-srv-voice-rfc3263-procedure-order, checked 2026-09-24}
}