[SIPForum-discussion] What should proxies respond to OPTIONS ?

[nitin kapoor]

Hello,

OPTIONS method is used to query a user agent or server about its
capabilities and discover its current availability. The response to the
request lists the capabilities of the user agent or server. A proxy never
generates an OPTIONS request. A UA or server responds to the request as it
would to an INVITE (i.e., if it is not accepting calls, it would respond
with a 4xx or 6xx response). A success class (2xx) response can contain
Allow, Accept, Accept-Encoding, Accept-Language, and Supported headers
indicating its capabilities. An OPTIONS request may not contain a message
body. A proxy etermines if an OPTIONS request is for itself by examining the
Request-URI. If the Request-URI contains the address of the proxy, the
request is for the proxy.Otherwise, the OPTIONS is for another proxy or user
agent and the request is forwarded.

Thanks,
Nitin Kapoor

2009/4/15 Yevgen Krapiva <ykrapiva at gmail.com>

> Hi again.
>
> The quotation from RFC about OPTIONS request:
>
> >   Allow, Accept, Accept-Encoding, Accept-Language, and Supported header
> >   fields SHOULD be present in a 200 (OK) response to an OPTIONS
> >   request.  If the response is generated by a proxy, the Allow header
> >   field SHOULD be omitted as it is ambiguous since a proxy is method
> >   agnostic.
>
> If Allow header should not be present in proxy's response, then what
> should I reply in Accept* headers ? And how to say that this proxy
> understands SUBSCRIBE and REGISTER methods, for example ?
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