RFC 3204 (rfc3204) - Page 2 of 10
MIME media types for ISUP and QSIG Objects
Alternative Format: Original Text Document
RFC 3204 ISUP and QSIG MIME Objects December 2001 QSIG is the analogous signaling protocol used between private branch exchanges to support calls within private telephony networks. There is a similar need to transport QSIG-encoded signaling information between SIP entities in some environments. This document is specific to this usage and would not apply to the transportation of ISUP or QSIG messages in other applications. These media types are intended for ISUP or QSIG application information that is used within the context of a SIP session, and not as general purpose transport of SCN signaling. The definition of media types for ISUP and QSIG application information does not address fully how the non-SIP and SIP entities exchanging messages determine or negotiate compatibility. It is assumed that this is addressed by alternative means such as the configuration of the interworking functions. This is intended to be an IETF approved MIME type, and to be defined through an RFC. NOTE: usage of Q.SIG within SIP is neither endorsed nor recommended as a result of this MIME registration. 3. Proposed new media types ISUP and QSIG messages are composed of arbitrary binary data that is transparent to SIP processing. The best way to encode these is to use binary encoding. This is in conformance with the restrictions imposed on the use of binary data for MIME (RFC 2045 [3]). It should be noted that the rules mentioned in the RFC 2045 apply to Internet mail messages and not to SIP messages. Binary has been preferred over Base64 encoding because the latter would only result in adding bulk to the encoded messages and possibly be more costly in terms of processing power. 3.1 ISUP Media Type This media type is defined by the following information: Media type name: application Media subtype name: ISUP Required parameters: version Optional parameters: base Encoding scheme: binary Security considerations: See section 5. The ISUP message is encapsulated beginning with the Message Type Code (i.e., omitting Routing Label and Circuit ID Code). Zimmerer, et al. Standards Track
