Linksys WIP310 SPA500 Series and WIP310 IP Phone Administration Guide - Page 133

Configuring Security, Quality, and Network Features Configuring Domain and Internet Settings 5 Parameter DTMF Tx Method DTMF Tx Volume for AVT Packet Description Select the method to transmit DTMF signals to the far end: InBand, audio video transport (AVT), INFO, Auto, InBand+INFO, or AVT+INFO. InBand sends DTMF using the audio path. AVT sends DTMF as AVT events. INFO uses the SIP INFO method. Auto uses InBand or AVT based on the outcome of codec negotiation. Defaults to Auto. Allows you to manually configure the AVT Tx volume. The value of this parameter is inserted into the volume field of the payload in the AVT packet. Values are based on the AVT specification as described in RFC 2833, RTP Payload for DTMF Digits, Telephony Tones and Telephony Signals. According to RFC 2833, the volume field is represented by 6 bits, and describes the power level of the tone, expressed in dBm0 after dropping the sign. Valid range for this parameter is 0 to 63. If the provisioned value is negative, it will be negated first. Thereafter, if the value is beyond the high limit of 63, it will be clipped to 63. The default value is 0, and is the recommended setting. However, some gateways do not accept this volume setting. If the gateway does not accept the value of 0, the DTMF tone is not relayed to the remote end. As a workaround for the phone to interoperate with those gateways, you can change the value to a value greater than 0. STEP 5 Click Submit All Changes. Configuring Domain and Internet Settings Configuring Restricted Access Domains You can configure restricted access domains. If you enter domains, the Cisco IP phones respond to SIP messages only from the entered servers. STEP 1 Log in to the web administration interface. STEP 2 Click Admin Login and advanced. Cisco SPA 500 Series and WIP310 IP Phone Administration Guide 122