I have a combination of LD carriers with multiple local carriers. This scenario is Qwest as the provider of the longhaul and SBC as the local carrier.

I had a situation late yesterday where my PBX rebooted. The recovery time was approx 7-8 minutes. When the switch came back up we looked at the T1's in the switch and saw all D & B channels up on all 27 T1's.

Approx. 2.5 hrs later, 6 of my T1's (last mile being SBC) lost their D & B channels. There was carrier signal (green light on the CSU's) on the T1's but there was no traffic. I didn't see this until 6am the next day.

To make a long story short, Qwest looked into this from 7:20am until 9:15am and realized that they needed to down the PRI's and bring them back up in their switch. The PRI's came up and I maxed out my trunk group as fast as they came up.

Here's the question. My circuits come from Qwest and come through a DAC at SBC to get to my facility. Can SBC keep those D & B channels up for that long of a period (2.5hrs) before my switch was notified there was no D or B channels up from QWEST??

I feel the answer is "no" and that QWEST 2.5hrs later took the D & B channels down and is telling me that it was my switch that caused it.

Had to paint the picture before getting to the question.

Insight would be great! Thanks!:cool:

Have you spoken to SBC about this issue, as they own the last mile I would have thought that it is down to them to resolve it?