What does this Call/Transaction Does Not Exist mean

[angeleye20]

What does this mean?

481 Call/Transaction Does Not Exist

I'm having some issues with external calls.

Is this a media negotiation problem?

Chris

[Jonathan Schulenberg]

We need the entire SIP dialog to know what's going on. Generically speaking 481 means that the Call-ID isn't valid.

Please remember to rate helpful responses and identify helpful or correct answers.

[Martin Koch]

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.