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difference between dtmf-relay sip-notify and dtmf-relay rtp-nte

Fellows,

Can anyone please explain the difference between dtmf-relay sip-nitofy and dtmf-relay rtp-nte.

When and why to use this.

Regards,

Rachna

2 REPLIES

difference between dtmf-relay sip-notify and dtmf-relay rtp-nte

DTMF tones are created when a digit is dialed on a telephone. By default, the gateway sends these tones within the voice RTP stream. When voice is sent uncompressed, these tones arrive in their original state. However, when voice is compressed, such as with the G.729 codec, the tones might be distorted, or part of the signal might be lost. DTMF Relay addresses this by separating these tones from the rest of the voice and then sending them in a different way

example when you call and IVR or caontact center you need to press 1 to go to sales for example and this button is the DTMF

RTP-NTE Uses a method specified in RFC 2833 to send DTMF tones within the RTP stream, in a special Named Telephony Event (NTE) packet. The use of this method and the payload type value is negotiated on a call-by-call basis.

H.245 Alphanumeric Is specified by the ITU-T H.245 standard. Tones are sent over the H.245 signaling channel, rather than in-band with voice traffic. H.245 transmits DMTF tones to the receiving gateway as the ASCII character it represents (1, 2, 3, and so on). It does not send tone-length information. Each tone is assumed to last 500 milliseconds (ms). All H.323 gateways must support this type of

DTMF RelayH.245 Alphanumeric Is specified by the ITU-T H.245 standard. Tones are sent over the H.245 signaling channel, rather than in-band with voice traffic. H.245 transmits DMTF tones to the receiving gateway as the ASCII character it represents (1, 2, 3, and so on). It does not send tone-length information. Each tone is assumed to last 500 milliseconds (ms). All H.323 gateways must support this type of DTMF Relay

SIP has its own DTMF types too

hope this help

if helpful Rate

Cisco Employee

difference between dtmf-relay sip-notify and dtmf-relay rtp-nte

Hi

dtmf-relay rtp-nte :

          DTMF tones are transported in the RTP voice packet itself using the NTE method for encoding and decoding on respective endpoints

dtmf-relay sip-notify

          When the DTMF is recognized, the Sip Gateway uses Sip Notify which is a signalling message.

Regards,

Senthilkumar

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