What does this Call/Transaction Does Not Exist mean

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Jun 29th, 2012
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What does this mean?

481 Call/Transaction Does Not Exist

I'm having some issues with external calls.

Is this a media negotiation problem?


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Jonathan Schulenberg Fri, 06/29/2012 - 14:55
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We need the entire SIP dialog to know what's going on. Generically speaking 481 means that the Call-ID isn't valid.

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Martin Koch Fri, 06/29/2012 - 18:40
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Hi Chris,

some more verbose info, (like Johnatan also mentioned)  would be helpful.

Also include some info about your setup, involved components, call flow, ....

In a VCS enviroment I had seen it when there were firewall/alg/nat helper which messed

with the call or anything else dropping or tempering sip messages.


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