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

Yevgen Krapiva ykrapiva at gmail.com
Thu Apr 16 10:23:27 UTC 2009

Thanks a lot. But RFC might be more accurate with such statements.

2009/4/16, Tomasz Zieleniewski <tzieleniewski at gmail.com>:
> Hi,
> As it is written "SHOULD" doesn't imply "MUST"
> generally proxy is method agnostic but in case when your proxy
> acts as registrar and subscription server (in other words as UAS)
> then it can respond with response containing Allow header with values
> Kind regards
> - Tomasz Zieleniewski
> 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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