RFC 4967: Dial String Parameter for the Session Initiation Protocol Uniform Resource Identifier

RFC 3966 explicitly states that 'tel' URIs may not represent a dial string. That leaves no way specify a dial string in a standardized way. Great confusion…

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Outgoing relationships (4 related RFCs)

Normative reference — RFC 2119: Key words for use in RFCs to Indicate Requirement Levels
Normative reference — RFC 3261: SIP: Session Initiation Protocol
Normative reference — RFC 3966: The tel URI for Telephone Numbers
Normative reference — RFC 3969: The Internet Assigned Number Authority (IANA) Uniform Resource Identifier (URI) Parameter Registry for the Session Initiation Protocol (SIP)

Incoming relationships (1 related RFC)

Normatively referenced by — RFC 9248: Interoperability Profile for Relay User Equipment