VOS3000 转码 DTMF 配置指南：G729编码转换、RFC2833与SIP INFO双音多频设置、DTMF透传与Payload配置完整教程。
VOS3000 DTMF Configuration: RFC2833 vs SIP INFO Important Setup Guide
VOS3000 DTMF configuration guide comparing RFC2833, SIP INFO, and Inband methods. Step-by-step setup for IVR, DTMF relay, and troubleshooting DTMF issues in VoIP.