Cisco Cisco PVC300 Pan Tilt Optical Zoom Internet Camera 维护手册

Configuring Port Forwarding Rules

Cisco Small Business Administration Guide for the Model PVC300 PTZ Internet Camera with Audio and PoE

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There are some additional configuration settings to make in order 

For 2-way audio over the Internet to work on your PVC300 camera, you need to 
configure additional settings, as shown in the example in the following diagram.

Cameras accessed over the Internet that require 2-way audio must use a unique 
RTSP port. Routers with Port Address Translation should map the same external 
port as used on the inside LAN network. 

In the above example, PVC300 #2 external <wan-ip>:8554 maps to internal 
<lan-ip>:8554. Consult your network administrator for alternative port 
suggestions. Port# 8554 is designated as an alternate RTSP port by the Internet 
Assigned Numbers Authority (IANA).

2-way audio is not supported in HTTP 

mode under Client Settings.