We have Polycom 2w (analog PBX line) units at an ESS location connected via MPLS to an s8710. Calls originating from this unit are routed over the MPLS to the s8710 and then out over locally connected facilities. These calls connect successfully to the AT&T conference service, but when they input the touch tone conference code, it is not recognized or the digits are mis-interpreted. This happens on all of the Polycom units at this location. Polycoms locally connected to the s8710 are fine... any ideas what to look at to resolve? Thanks.