H3C Technologies H3C MSR 50 - Manual (Page 618)

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6. Select RFC2833 for DTMF Transmission Mode.
7. Click Apply.
# Enable the feature service.
8. Select Voice Management > Local Number from the navigation tree, and click the icon of local
number 3000 to access the call services page as shown in Figure 622 .
Figure 622 Enabling the feature service
9. Select Enable for Feature Service.
10. Click Apply.
Verifying the configuration
After the above configuration, dial feature code *425*1000# at Telephone C, and you can monitor the
conversation between Telephone A and Telephone C. If you want to participate in the conversation, dial
*428# at Telephone C.