This means it is almost certainly your telco - I'd say it definitely is.
Sounds like if you are just calling roundtrip through the switch the PM
gets its lines from then it is ok. But calls coming in externally
and being routed onto the PM's line, or going out of the switch from the
PM, are choked, no DOV.
If the PM-3 can make any DOV calls it isn't the PM-3, and if the PRI
can handle any DOV it isn't that PRI. So you need to look upstream
starting with the switch. Have fun in telco land.
-MZ
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