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Target release6.10.0
Epic

BRKT-810 - Getting issue details... STATUS

Feature Request

BRKT-809 - Getting issue details... STATUS

Document status

FINAL

Document owner

Goals

  • As per an OpenText partner, Skype just needs the SR140 SDP to indicate support for RFC2833.  This feature is to enable the SR140 to indicate support for RFC2833 without the requirement to send out-of-band tones.

Background and strategic fit

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.  Technically, RFC 2833 has been replaced by RFC 4733, but for the most part people call it 2833.

RFC 2833 is negotiated through Session Description Protocol (SDP).  SDP is used to describe the voice stream (e.g. G.711) and it’s also used to inform the recipient that RFC 2833 is available.  Specifically, it uses something called telephone-event. 

Lync expects that the connecting endpoint will state that RFC 2833 is available or it will not accept the call regardless of what voice codec is available. To connect to Lync the SR140 will be required to add the following items into the SDP to show it supports RFC2833:

a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15

The SR140 will not be required to generate any outbound RFC2833 events.  

Assumptions

Requirements

#TitleUser StoryImportanceNotes
1Keyword to enable featureAdd a new keyword to enable this feature into the SIP section of the callctrl.cfg file. In the future this keyword may be used to enable RFC2833 if the capabilities to do so has been added to the product. This parameter shall be an enabled/disabled setting and will default to false.Must Have

Parameter Name TBD

2Advertise support for RFC 2833

When the feature is enabled, the outbound SDP will show support for RFC2833. It shall show support for events 0-15.

a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15

Must Have 
3No RFC2833 eventsThe SR140 is not required to generate any RFC2833 events. DTMF tones generated will not change from the current implementation. The tones will be sent as a part of the RTP audio stream. Support for generating RFC2833 or RC4733 events may be added at a future time but it is not a requirement for this feature request.Must Have 
4DocumenationThe documentation for this feature shall state that this parameter only advises support for RFC2833 and that the product will not generate RFC2833 events. This parameter should be only enabled when advised by tech support.Must Have 

References

User interaction and design

Questions

Below is a list of questions to be addressed as a result of this requirements document:

QuestionOutcome

Not Doing

  •  Sending RFC2833 Events

 

High Level Design Document

The HLD was combined with the HLD for RFC 2833 inbound support.  It can be reached directly with this link.

Tasks Releated to Feature

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