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Voice Settings 51
SmartLink 4050 Series Getting Started Guide 5 • Using the configuration menu
• External SIP Port: External SIP port
• External Media Port: External media port
Note It has to be complied with the settings of virtual server of the NAT devices if
IP Phone enables the configuration manually.
• UPnP: Enable or disable universal plug and play. Some NAT supports UPnP so STUN is not required and
must be disabled.
• Always send keepalive packet: Enable or disable to keep the channel which is created for SIP signaling
alive.
• KeepAlive Time: The time interval that the IP phone always sends the keepalive packet in order to ensure
NAT works properly.
Voice Settings
Click on Voice Settings to display the configuration window (see figure 19).
Figure 19. Voice Settings
• Codec (Priority 1 ~ 3): Voice Compression Algorithm priority settings. Select from the most used codec to
the least used codec.
• RTP Packet Length: The payload size for each RTP packet.
• VAD: Support VAD for silence suppression. When Enable is selected, it also supports SID frame for CNG.
• DTMF Method: Select the method to generate DTMF. Out Band DTMF is based on RFC2833.
• Payload Type: Setting the payload type for the Out Band DTMF (Default is 101).