| Summary: |
The Session Initiation Protocol (SIP) INFO method
defines a means for transporting mid-dialog application layer data
between user agents. Its initial use was to
support the transport of ISUP mid-call messages which
could not be mapped to any other SIP request
method. However, since its initial usage for that purpose,
INFO has seen widespread abuse as a means for introducing
non-standard and non-interoperable extensions to SIP. For
this reason, we now believe INFO should be considered
harmful, and therefore, deprecated in its current
form.
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