[Serusers] OPTIONS method

Nils Ohlmeier nils at ohlmeier.de
Tue Mar 11 14:30:35 CET 2003

Hi Greg,

OPTIONS is a request which determines the capabilities of the destination. A 
UA or a proxy should answer with its supported features (see RFC for 
I think Ser is currently not able to answer such a request correctly. But i 
have never seen a UA which queried the server. You can send an OPTIONS 
whenever you want, for example to change the connection with a re-INVITE, 
allthough it makes more sence to query the capabilities before a connection.

But OPTIONS is also used for "traceroute" (see RFC for details, and sipsak for 
an implementation) because it do not establish a call to the UA.


On Tuesday 11 March 2003 05:04, Greg Fausak wrote:
> What, if anything, should the SER server do with a
> OPTIONS method?
> I am receiving this method, from a phone, right after the
> phone makes a conversation.  That is, the final ACK is
> sent from the phone and a call is in progress when the phone decides
> to send an OPTIONS message.  I thought OPTIONS was a pre-call
> sort of thing, not for the current call.
> Anyway, I thought I could just capture the OPTIONS method and send
> a 486 busy reply with sl_send_reply().  Didn't work.
> ---greg
> _______________________________________________
> Serusers mailing list
> serusers at lists.iptel.org
> http://lists.iptel.org/mailman/listinfo/serusers
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