PSTN and Internet Internetworking (pint)

Status: Concluded February, 2001 
 Steve Bellovin 
 Igor Faynberg 
Description of Working Group:
The PSTN/Internet Interfaces (PINT) WG addresses connection
arrangements through which Internet applications can request and enrich
PSTN (Public Switched Telephone Network) telephony services.  An
example of such services is a Web-based Yellow Pages service with the
ability to initiate PSTN calls between customers and suppliers.
This working group has six main objectives:
* Study architecture and protocols needed to support services in which a
  user of the Internet requests initiation of a telephone (i.e., PSTN-
  carried) call to a PSTN terminal (i.e., telephone, FAX machine).
  The protocols are not to support any form of third-party call control 
  for that matter, any type of call control; their role is rather to
  securely carry call requests to the PSTN. Specific services to be
  considered initially are Click-to-Dial, Click-to-Fax, 
  and Web access to voice content delivered over the PSTN.
* Produce an informational RFC that describes current practices for
  supporting the services in question.
* Based on the existing practice and agreed on improvements, develop a
  standards track RFC that specifies a Service Support Transfer Protocol
  (SSTP) between Internet applications or servers and PSTN Intelligent
  Network Service Nodes (or any other node that implement the Service
  Control Function).  SSTP is an application-specific transport protocol
  operating over TCP.
* Consider security issues relating to prividing functions of this
  type. In particular understand any threats posed by this technology
  and resolve them, and any other security issues in the proposed 
* Based on the existing practice and agreed on improvements, develop a
  standards track RFC for a relevant MIB (SSTP MIB) to support the 
  management protocol between Internet applications and the PSTN Service
  Management System. The SSTP MIB is to conform to SNMP standards.
* Consider extensions of the above architecture and protocols to support 
  wider range of PSTN Intelligent Network (IN) based services.

Request for Comments:

  • RFC2458 Toward the PSTN/Internet Inter-Networking --Pre-PINT Implementations (Informational)
  • RFC2848 The PINT Service Protocol:Extensions to SIP and SDP for IP Access to Telephone Call Services (Proposed Standard)
  • RFC3055 Management Information Base for the PINT Services Architecture (Proposed Standard)