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| Tags: calls, inbound, pri, silence |
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 10-11-2006, 04:30 PM | #1 (permalink) | ||||||||
| Junior Member
Rep Power: 0  | Inbound silence on PRI calls I've got an Option11C running 25.30. I've had a Bellsouth PRI installed and working fine for the past 4 years. All of a sudden, when inbound calls hit the switch, the caller isn't hearing ringback. The personnel in the office do hear the phones ring...they answer...and cannot hear anyone on the other end...nor can the caller hear them answer. They usually get through on subsequent attempts. I've reloaded the switch...no improvement. I've also verified that the problem is occurring on multiple channels on the PRI. I looked at some dchannel messages today and can't see any differences between the successful calls and the failed calls. I've had a ticket opened with Bellsouth for a week...they insist their PRI looks clean. What is my next step here? thanks in advance.... | ||||||||
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| 10-11-2006, 04:52 PM | #2 (permalink) | ||||||||
| Junior Member
Rep Power: 3 | I had a similar problem last week. We had intermitent one-way conversation on calls from California to Arizona. The calls went through SBC/ATT to Qwest long distance to Frontier/Citizens. We found the trouble on more than 1 T1 span from Qwest to Frontier. We had to get all the vendors on line and make lots of calls to isolate the trouble. Qwest said the span tested OK but the calls proved to have one-way transmission. | ||||||||
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| 10-11-2006, 11:16 PM | #3 (permalink) | ||||||||
| Senior Member 
Location: 3498.51 miles from Tiverton, Ontario (CANADA) Rep Power: 16 | Usually when the vendors 'test' or 'look' at the span they are only looking at the carrier and not beyond that to the other levels so thus the PRI always looks clean. I take if that from looking at the DCH messages that the problem doesn't occur on the same channel? Do you place calls out on this PRI? If so are does the problem exist there as well? If not can the circuit accept outbound calls for testing? This is another one of those situations where a T1 tester is a handy tool to have on hand. | ||||||||
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