Configuration 3.3771. Receive as audio / Send as tones – transmits the DTMF signals in the audiochannel. This setting is unsuitable for cases where the audio channel iscomprised using high-compression codecs such as GSM codecs.2. Receive as RTP / Send as RTP – transmits DTMF signalling as special RTPpackets according to the RFC2833 recommendation.3. Receive as SIP INFO / Send as SIP INFO – transmits DTMF signalling usingthe SIP INFO packets as recommended in RFC2976.To send DTMF signalling during a call use the 0 to 9, * and # keys. You canalso disable this function, enable for outgoing calls only, or enable forincoming and outgoing calls by setting the Send during call parameter.Video Codecs2N® Helios IP uses video codec H.264 or H.263. You can set their parameters in sucha manner that the video transmitted conforms to the needs of the opponent.Figure 3.25 Video Codec SettingsPreferred Video CodecsSet the priority of video codecs for call set-ups.
