call disconnected with out of service displayed on CUPC

Unanswered Question
Feb 26th, 2009

We just deployed the 7921 phones and the call quality has been very good (4.5 MOS) about two days ago I was in a call; 10 seconds in it the call got disconnected. All I have is that the person I was calling got an Out of Service on his CUPC. So he was running CUPC in phone mode and I was talking to him from my 7921 to his 7970. I just need some pointers on how I should proceed in troubleshooting this so I can prevent a future calls like this.

Thank you...

I have this problem too.
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