Ours is a B2BUA. Currently if we are receiving the 4xx response (for eg. 486
Busy Here) from the terminating called party,then after ACKing the same we are
sending the BYE to originating calling party and dropping the connection
instead of proxying the 486 response to originating. Is it correct way of doing
it? Are B2BUA supposed to proxy error responses? Any RFC specifying the
behaviour of B2BUA?regards,rishabh
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