[AVT] Re: Question on MFR1 in draft-ietf-avt-rfc2833bis-02.txt
Henning Schulzrinne <hgs@cs.columbia.edu> Sun, 29 June 2003 17:19 UTC
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Date: Sun, 29 Jun 2003 13:09:03 -0400
From: Henning Schulzrinne <hgs@cs.columbia.edu>
Organization: Columbia University
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To: Zhenfu Lin <ZLin@broadcom.com>
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Subject: [AVT] Re: Question on MFR1 in draft-ietf-avt-rfc2833bis-02.txt
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Zhenfu Lin wrote: > Hello editors. > > I have a couple of quesions regard MFR1. My apologies for the delay in responding. > > 1) What is the frequency pair for MF R1 S3 in Table 6 of > draft-ietf-avt-rfc2833bis-02.txt? (I am guessing that it is frequency > pair 700/1700 Hz.) This was a mistake, related to the item below. > 2) Both KP and KP1 refer to the same frequency pair, namely 1100/1700 > Hz. In Table 6, KP is mapped to 138 and KP1 is mapped to 139. So, > frequency pair 1100/1700 Hz maps to two codes (138 and 139). - a: > Does this mean that one of these codes is used when a RFC 2833 packet > is generated? Which one should be used? - b: Does this mean that the > receiver is prepared to receive both codes, and map both to the > frequency pair 1100/1700 Hz? This was a bug caused by confusion in the description and labeling of these tones. I've now cleaned this up and removed duplicates, so that each frequency pair has a single label: MF 0\ldots 9 & 128\ldots 137 & & yes\\ MF 700/1700 (Code 11, KP3P, ST3P) & 138 & & yes\\ MF 1100/1700 (KP, KP1) & 139 & & yes\\ MF 1300/1700 (KP2, ST2P) & 140 & & yes\\ MF 1500/1700 (ST) & 141 & & yes\\ MF 900/1700 (Code 12, STP) & 142 & & yes\\ I've looked at a variety of sources (ITU Q.140/Q.151, Freeman, GR-506) and the labeling seems now self-consistent. -03 should appear early next week. > > Thank you. > > Zhenfu _______________________________________________ Audio/Video Transport Working Group avt@ietf.org https://www1.ietf.org/mailman/listinfo/avt
- [AVT] Question on MFR1 in draft-ietf-avt-rfc2833b… Zhenfu Lin
- [AVT] Re: Question on MFR1 in draft-ietf-avt-rfc2… Henning Schulzrinne