How do you know it *really* is phone B that is asking for the HOLD? 

> From: [EMAIL PROTECTED] 
> [mailto:[EMAIL PROTECTED] On 
> Behalf Of SCG2
> 
> Is there any circumstance at all where it makes sense to 
> challenge an INVITE which is putting a call on hold?
> 
> I can find nothing in 3264 that suggests it, but wondered if:
>
> Phone A -> Phone B (in doing so phone A may have been authenticated)
> 
> Phone B later goes to put phone A on hold

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