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Global SIP Settings
4-72 41-001160-00, Release 2.1, Rev 04
IP Phone Administrator Guide
Configuring the IP Phones
Click on Advanced Settings->Line <N>->RTP Settings.
Per-Line Settings.
2 Enter an RTP Port Base in the RTP Port field. Default is 3000.
The RTP Port indicates the port through which the RTP packets are sent. This value must specify the
beginning of the RTP port range on the gateway or router. The RTP port is used for sending DTMF
tones and for the audio stream. Your network administrator may close some ports for security
reasons. You may want to use this parameter to send RTP data using a different port.
3 Enable the "Basic Codecs (G.711 u-Law, G.711 a-Law, G.729)" field by checking the check box.
(Disable this field by unchecking the box. Default is disabled).
Enabling this parameter allows the IP phone to use the basic Codecs when sending/receiving RTP
packets.
4The "Force RFC2833 Out-of-Band DTMF" field is enabled by default. Disable this field by
unchecking the box.
Enabling this parameter forces the IP phone to use out-of-band DTMF according to RFC2833.
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