What is RTP event?

What is RTP event?

(RTP) packets. The RTP payload format for a DTMF event is designated as a “telephone-event,” with the media type as an “audio/telephone-event” in negotiation. The named telephone events are carried as part of the voice stream and use the same sequence number and time- stamp base as the regular voice channel.

What is telephone event in SDP?

SDP is used to describe the voice stream (e.g. G. 729) and it’s also used to inform the recipient that RFC 2833 is available. Specifically, it uses something called telephone-event. That’s probably about as much as you really need to understand about RFC 2833 and how it works.

What is RFC2833?

RFC 2833 (RTP Payloads for DTMF Digits, Telephony Tones, and Telephony Signals) specifies an RTP payload format for carrying dual-tone multi frequency (DTMF) digits, and other line and trunk signals. RFC 2833 specifies a packet format for DTMF digits, line events, and trunk events.

What is the RTP Payload Format for named Telephone Events?

The RTP payload format for named telephone events is designated as “telephone-event”, the media type as “audio/telephone-event”. In accordance with current practice, this payload format does not have a static payload type number, but uses an RTP payload type number established dynamically and out-of-band.

Do you need payload 101 for ITSP DTMF?

First of all you need to get in touch with your ITSP. This INVITE has no DTMF capabilities advertised. You need to sort their side out first before proceeding further. Here payload 101 is used for telephone-event (DTMF). In your SDP we dont see any of this.

What kind of payload does Cisco use for RTP-NTE?

This means that different carriers can use any payload from 96 -127. Cisco typically uses 101 for rtp-nte. In your case your provider is using 100. This in itself could cause you some issues because on cisco gateways payload 100 is assigned to modem pass-through.. 01-06-2016 06:13 AM 01-06-2016 06:13 AM

How is RTP used in a telephone network?

In the “RTP trunk” application, RTP is used to replace a normal circuit-switched trunk between two nodes. This is particularly of interest in a telephone network that is still mostly circuit- switched. In this case, each end of the RTP trunk encodes audio channels into the appropriate encoding, such as G.723.1 or G.729.