| Abstract
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There is no defined mechanism today by which SIP proxies can insert
path related information in a SIP message that is being routed
across a network.
As an example, a network administrator may want to trace the path as
a SIP message traverses across her network to detect failure
points.
As another example, a user may want to discover capabilities of
servers in the path of a call. Although there is an informal mention
of using the OPTIONS method to achieve the latter example [1], there
is no defined way to achieve the same today.
This draft describes the requirements that need to be met for
introducing a scheme that allows SIP based entities to record path
related information.
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