ISUP Cause Location Parameter for the SIP Reason Header Field

Document Type Replaced Internet-Draft (individual)
Author Roland Jesske 
Last updated 2017-05-16
Replaces draft-jesske-sipcore-reason-q850-loc
Replaced by RFC 8606
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Intended RFC status (None)
Expired & archived
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IESG IESG state Replaced by draft-ietf-sipcore-reason-q850-loc
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


The SIP Reason header field is defined for carrying ISUP cause values as well as SIP response codes. Some services in SIP networks may need to know the ISUP location where the call was released in the PSTN network to correctly interpret the reason of release.


Roland Jesske (

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