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Netvanta 6310 goes to one way audio after 5:13 on internal calls

We have a Netvanta 6310 that is deployed.  When internal calls are made in the BG the call will go to one way audio after 5:13.  On the Adtran we have the Sip ALG disables.  Are there other settings I should look into that may be causing this.  It seems like something is causing a pin hole? 


Thank you, 


Donnah M.

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