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DOI: https://doi.org/10.17487/RFC7195
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This memo describes use cases, requirements, and protocol extensionsfor using the Session Description Protocol (SDP) offer/answer modelfor establishing audio and video media streams over circuit-switchedbearers in the Public Switched Telephone Network (PSTN).
For the definition ofStatus,seeRFC 2026.
For the definition ofStream, seeRFC 8729.