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Protocol Action: ISUP to SIP Mapping to Proposed Standard
The IESG has approved publication of the following Internet-Drafts as
o Mapping of ISUP Overlap Signaling to the Session Initiation
This document is the product of the Session Initiation Proposal
Investigation Working Group. The IESG contact persons are Allison
Mankin and Scott Bradner.
The "ISUP to SIP Mapping" document takes into consideration ISUP
en-bloc signalling, which means sending the complete telephone
number of the callee in the first signalling message. Although modern
switches always use en-bloc signalling, some parts of the PSTN still
use overlap signalling, and this is the subject of the second document,
"Mapping of ISUP Overlap Signaling to the Session Initial Protocol."
Overlap signalling consists of sending just some digits
of the callee's number in the first signalling message.
Further digits are sent in subsequent signalling messages.
Working Group Summary
The current version of the document reflects the issues raised during
the IETF Last Call.
This document was reviewed for the IESG by Allison Mankin.