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Getting "SIP/2.0 503 Cannot Create Transport Connection"

Hi there

 

We have a 9200 SBC, that is sending back "SIP/2.0 503 Cannot Create Transport Connection"

In response to a INVITE (re-invite for a 30 min call in progress)

And then the call fails

 

I don't know what this is telling me.

Has anyone experience this before?

Or can anyone explain why the 9200 is sending this?

 

Or suggest logs, other items I could check?

 

Gary

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