Recently we deployed IPT for our customer to replace the traditional PBX system. Everything is ok except the POS machine behind the VG202. We find that the POS machine transmits slowly than in the PBX system. We use sccp between CM7.0 and VG202, MGCP between C3825 and CM, fax and other analog phones work well on the same VG. Modem relay has been enabled on the VG, anything else I missed?