[Sip] INFO Issue: Ignore Non-Supported Info Package Types

[Eric Burger <eburger at standardstrack.com>]

The text currently says that if one endpoint indicates it does not  
support an Info-Package, that endpoint is to ignore subsequent Info- 
Send headers sent by the other endpoint that continues to indicate  
support for that Info-Package.

On the one hand, this continual resending of an Info-Send offer does  
no harm, in that unless the recipient indicates support of that  
package, the sender will not send it.  Moreover, 
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