ThinkTel supports T.38 in the following scenarios: * 2-way Direct media VoIP calls. * 2-way TDM-to-VoIP (and vice versa) calls. * 2-way TDM-to-TDM calls between two different Universal Media Gateways (UMG). T.38 is not supported in the following scenarios: * Non-direct media VoIP calls, regardless of whether …