Dahua VTH5221DW-C - Page 27

Figure 5-10
Step 2. Enter room no. you want to call, press icon to call. After call is
accepted, you can perform a bidirectional talk.
See Figure 5-11.
Tips:
If you want to call extension of the VTH , such as 9901-1, just enter “-1” to call it.
Figure 5-11