On CUCM6.0.1 we use mobileconnect with access to midcall features like transfer.To do that we have to validate the "MTP Required" option on the gateway. This is our H323 PRI PSTN gateway (3825) through which outgoing calls to mobiles go and through which we access mobileconnect DID number. But this gateway support also incomming and ougoing fax calls to and from a H323 VG224. When MTP is not validate, all fax calls are T38 (14400) and work very well, when MTP is validate all fax calls fall back to Cisco Fax-relay mode and fail very often. Why is t38 imcompatible with MTP?