2004
The SPIRITS (Services in PSTN requesting Internet Services) Protocol.
[DOI]
Vijay K. Gurbani
,
Alec Brusilovsky
,
Igor Faynberg
,
Jorge Gato
,
Hui-Lan Lu
,
Musa R. Unmehopa
RFC, October, 2004

2002
Service in the Public Switched Telephone Network/Intelligent Network (PSTN/IN) Requesting InTernet Service (SPIRITS) Protocol Requirements.
[DOI]
Igor Faynberg
,
Jorge Gato
,
Hui-Lan Lu
,
Lev Slutsman
RFC, August, 2002