181 should follow the rules for any other provisional response. So you 
could include SDP in the same cases where you might if it were a 183. 
You are governed by the general offer/answer rules.

        Paul

Sumin Seo wrote:
> Hi All,
> 
> Let's say I want to play announcement to let user know that his call is
> being forwarded.
> can 181 response have SDP for this kind of purpose?
> 
> Thanks in advance for you help.
> 
> Regards,
> Sumin.
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> [email protected]
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> 
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