RFC 3666 (rfc3666) - Page 2 of 118

Session Initiation Protocol (SIP) Public Switched Telephone Network (PSTN) Call Flows

Alternative Format: Original Text Document
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RFC 3666                  SIP PSTN Call Flows              December 2003


Table of Contents

   1.  Overview.....................................................   2
       1.1.  General Assumptions....................................   3
       1.2.  Legend for Message Flows...............................   4
       1.3.  SIP Protocol Assumptions...............................   5
   2.  SIP to PSTN Dialing..........................................   6
       2.1.  Successful SIP to ISUP PSTN call.......................   7
       2.2.  Successful SIP to ISDN PBX call........................  15
       2.3.  Successful SIP to ISUP PSTN call with overflow.........  23
       2.4.  Session established using ENUM Query...................  32
       2.5.  Unsuccessful SIP to PSTN call: Treatment from PSTN.....  38
       2.6.  Unsuccessful SIP to PSTN: REL w/Cause from PSTN........  45
       2.7.  Unsuccessful SIP to PSTN: ANM Timeout..................  49
   3.  PSTN to SIP Dialing..........................................  54
       3.1.  Successful PSTN to SIP call............................  55
       3.2.  Successful PSTN to SIP call, Fast Answer...............  62
       3.3.  Successful PBX to SIP call.............................  68
       3.4.  Unsuccessful PSTN to SIP REL, SIP error mapped to REL..  74
       3.5.  Unsuccessful PSTN to SIP REL, SIP busy mapped to REL...  76
       3.6.  Unsuccessful PSTN->SIP, SIP error interworking to tones  80
       3.7.  Unsuccessful PSTN->SIP, ACM timeout....................  84
       3.8.  Unsuccessful PSTN->SIP, ACM timeout, stateless Proxy...  88
       3.9.  Unsuccessful PSTN->SIP, Caller Abandonment.............  91
   4.  PSTN to PSTN Dialing via SIP Network.........................  96
       4.1.  Successful ISUP PSTN to ISUP PSTN call.................  97
       4.2.  Successful FGB PBX to ISDN PBX call with overflow...... 105
   5.  Security Considerations...................................... 113
   6.  References................................................... 115
       6.1.  Normative References................................... 115
       6.2.  Informative References................................. 115
   7.  Acknowledgments.............................................. 116
   8.  Intellectual Property Statement.............................. 116
   9.  Authors' Addresses........................................... 117
   10. Full Copyright Statement..................................... 118

1.  Overview

   The call flows shown in this document were developed in the design of
   a SIP IP communications network.  They represent an example of a
   minimum set of functionality.

   It is the hope of the authors that this document will be useful for
   SIP implementers, designers, and protocol researchers alike and will
   help further the goal of a standard implementation of RFC 3261 [2].
   These flows represent carefully checked and working group reviewed
   scenarios of the most common SIP/PSTN interworking examples as a
   companion to the specifications.



Johnston, et al.         Best Current Practice
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