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Adtran Atlas550 Timer Expiry Error

Adtran Atlas550 Timer Expiry Error

(OP)
I've been unable to find an explanation of some frequent status messages we see in our Adtrans:

Ntw1|1|Call clearing: TIMER_EXPIRY : Loc=U
Ntw2|1|DS0 Offhook-Originate Timer Expired
[ADTRAN]:DP Outgoing Signallin|Ntw2|1|Ds0:1 No Answer within 25 seconds

Ntw1 is connected to telco, Ntw2 is pbx. These are from various sites, not one.

We don't get complaints about dropped calls, but if it's intermittent and not always the
same users, I would never know.

Thanks.

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