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</v:background></xml><![endif]--><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;color:#1F497D'>Think I found my answer…..<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;color:#1F497D'><o:p> </o:p></span></p><p><span lang=EN>G.722 VoIP is typically carried in <a href="http://en.wikipedia.org/wiki/Real-time_Transport_Protocol" title="Real-time Transport Protocol">RTP</a> payload type 9.<sup id="cite_ref-1"><a href="http://en.wikipedia.org/wiki/G.722#cite_note-1"><span style='color:blue'>[2]</span></a></sup> Note that <a href="http://en.wikipedia.org/wiki/Internet_Assigned_Numbers_Authority" title="Internet Assigned Numbers Authority">IANA</a> records the clock rate for type 9 G.722 as 8 kHz (instead of 16 kHz), RFC3551<sup id="cite_ref-2"><a href="http://en.wikipedia.org/wiki/G.722#cite_note-2"><span style='color:blue'>[3]</span></a></sup> clarifies that this is due to a historical error and is retained in order to maintain backward compatibility. Consequently correct implementations represent the value 8,000 where required but encode and decode audio at 16 kHz.<o:p></o:p></span></p><p><span lang=EN>Whilst G.722 allows for bitrates of 64, 56 and 48 kbit/s, in practice, data is encoded at 64 kbit/s, with bits from the lower sub-band being used to encode auxiliary data. The greater the number of bits allocated to aux data, the lower the bit rate.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;color:#1F497D'>Regards,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;color:#1F497D'>Stephen<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'> freeswitch-users-bounces@lists.freeswitch.org [mailto:freeswitch-users-bounces@lists.freeswitch.org] <b>On Behalf Of </b>Stephen Dame<br><b>Sent:</b> Thursday, February 23, 2012 10:35 AM<br><b>To:</b> 'FreeSWITCH Users Help'<br><b>Subject:</b> [Freeswitch-users] G722 16k or 8k?<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span lang=EN>Question on G722, trying to see if the quality of basic g.722 is much better than the standard g729 or g711.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN>Looking at wiki docs. “G722 - G722 16kHz using default 20ms ptime. (multiples of 10)”<o:p></o:p></span></p><p class=MsoNormal><span lang=EN><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN>However, when I connect to freeswitch using blink client I see G722/8000? I thought this would be 16000. I know when I connect using speex wb, it shows 16000.</span><span style='font-size:11.0pt;color:windowtext'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;color:windowtext'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;color:windowtext'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;color:windowtext'>2012-02-23 10:20:07.116606 [DEBUG] mod_sofia.c:750 Local SDP sofia/internal/1004@107.XX.XX.XX:<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;color:windowtext'>v=0<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;color:windowtext'>o=FreeSWITCH 1329993171 1329993172 IN IP4 107.XX.XXX.XXX<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;color:windowtext'>s=FreeSWITCH<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;color:windowtext'>c=IN IP4 107.XX.XXX.XXX<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;color:windowtext'>t=0 0<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;color:windowtext'>m=audio 17236 RTP/AVP 9 101<o:p></o:p></span></p><p class=MsoNormal><b><span style='font-size:14.0pt;color:windowtext'>a=rtpmap:9 G722/8000<o:p></o:p></span></b></p><p class=MsoNormal><span style='font-size:11.0pt;color:windowtext'>a=rtpmap:101 telephone-event/8000<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;color:windowtext'>a=fmtp:101 0-16<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;color:windowtext'>a=silenceSupp:off - - - -<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;color:windowtext'>a=ptime:20<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;color:windowtext'>a=sendrecv<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;color:windowtext'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:16.0pt;color:windowtext'>Shouldn’t this be 16000?<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:16.0pt;color:windowtext'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:16.0pt;color:windowtext'>Thanks<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:16.0pt;color:windowtext'>Stephen<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:16.0pt;color:windowtext'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:16.0pt;color:windowtext'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;color:windowtext'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;color:windowtext'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;color:windowtext'><o:p> </o:p></span></p></div></body></html>