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3rd Party SIP Audio Stream Failure

Ladies and Gents,

I've set up a 3rd party sip phone and it's registered on CUCM 7. I can make and receive internal calls and all works fine. Problem is when I call (or get a call from) an external number, cellphone etc. I can not hear the person on the other end and they can't hear anything as well.

Am I missing a check in a box somewhere?

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