| 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. |