RFC 3263: Session Initiation Protocol (SIP): Locating SIP Servers

Publisher

IETF / RFC Editor

URL

https://www.rfc-editor.org/rfc/rfc3263

Published

2002-06-01

Updated

unknown

Accessed

2026-09-25

HTTP status

200

License

IETF Trust legal provisions (BCP 78); RFC text may be reproduced under IETF Trust terms; short excerpts and locators used here

Source notes citing this source

• RFC 3263 specifies that when no SRV records exist, the client does an A or AAAA lookup of the domain and uses the transport's default port (5060, or 5061 for TLS). in context
• RFC 3263 specifies that if no NAPTR records are found, a SIP client constructs SRV queries for the transports it supports. in context

Cite this source record

APA

WarmTransfer. (2002, June 1). RFC 3263: Session Initiation Protocol (SIP): Locating SIP Servers. WarmTransfer. https://warmtransfer.net/knowledge/sources/rfc-3263-sip-locating-servers

BibTeX

@misc{warmtransfer-rfc-3263-sip-locating-servers,
  title  = {RFC 3263: Session Initiation Protocol (SIP): Locating SIP Servers},
  author = {{WarmTransfer}},
  year   = {2002},
  url    = {https://warmtransfer.net/knowledge/sources/rfc-3263-sip-locating-servers},
  note   = {IETF / RFC Editor, accessed 2026-09-25}
}