This document describes MIME types for application/ISUP and application/QSIG objects for use in SIP applications@ according to the rules defined in RFC 2048. These types can be used to identify ISUP and QSIG objects within a SIP message such as INVITE or INFO@ as might be implemented when using SIP in an environment where part of the call involves interworking to the PSTN.
RFC 3204-2001由IETF - Internet Engineering Task Force 发布于 2001-12-01,并于 2012-05-31 实施。
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