With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cxeCallCtrlVoIpDtmfCodec
cxe Call Ctrl Vo Ip Dtmf Codec
1.3.6.1.4.1.9.9.325.1.1.1.1.4
This object identifies DTMF relay codec for VoIP. This object is not applicable if cxeCallCtrlVoIpDtmfRelay is DtmfRelayDisabled.
Back to CISCO-XGCP-EXT-MIB MIB page.
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