Hello,

I have a discussion with a colleague.

Its implementation sends back a 481 Transaction does not exist after an ACK is coming 
without an INVITE.

I told to him that this is not allowed. For an ACK never a response will generate, he 
has to ignore it. But now he will see in the RFC that it is not allowed to answer to 
an ACK. I was looking through the paper and I didn't find a text who says explicitly 
not to generate a response to an ACK.

Could somebody help me what can I do now?

Greeting

Markus
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