connectivity issues between ATTWS and 207.188.0.0/19

Hi all, we are having some issues with users attempting to reach our public netblocks via ATTWS. Our advertised ranges appear to be completely unreachable from their wireless network. The route-server.ip.att.net verifies our netblocks are seen and reachable, but this probably has something to do with the cingular network infrastructure. Connections via other providers- tmo, etc, all work fine. We are attempting to contact attws for support, but aren't making it beyond the 'is your ipsec client configured properly?' Could a clueful engineer please contact me off-list at their earliest convenience? Thanks kindly Chris