We should also be very clear that the Siren codecs are supported on the Polycom SoundStation conference phones and the VVX-1500 Business Media Phones. These codecs are not supported in the SoundPoint desk phones. The SoundPoint series support the more basic G.722 codec in the IP335/450/550/560/650/670 models.
Michael Graves mgraves mstvp.com o(713) 861-4005 c(713) 201-1262 sip:mjgra...@mstvp.onsip.com skype mjgraves > -------- Original Message -------- > Subject: Re: [asterisk-users] Are the Siren7 and Siren14 the G.722 HD > voice codecs? > From: Steve Underwood <ste...@coppice.org> > Date: Wed, January 05, 2011 6:09 pm > To: Asterisk Users Mailing List - Non-Commercial Discussion > <firstname.lastname@example.org> > > > On 01/06/2011 12:05 AM, Kevin P. Fleming wrote: > > On 01/05/2011 07:07 AM, Steve Underwood wrote: > >> On 01/05/2011 03:29 PM, Bruce B wrote: > >>> Hi Everyone, > >>> > >>> 1- Are the Siren7 and Siren14 the G.722 HD voice codecs? > >>> 2- Are these codecs only for Polycom units or are they universal > >>> across all other SIP phones that advertise the HD voice codec like > >>> Aastra? > >>> 3- What is the main difference between the two and is it advisable to > >>> run these over the INTERnet (not INTRAnet)? > >>> > >> The G.722 codec in * is G.722. The Siren7 codec in * is probably not > >> Siren 7, but G.722.1. G.722.1 is very similar to Siren7, but uses a > >> different code in the SDP and has some minor differences in the codec. > >> The name G.722.1 may look similar to G.722, but the codecs bear no > >> relation to each other. The Siren14 codec in * is probably not Siren14, > >> but G.722.1C. G.722.1C is very similar to Siren14, but like > >> Siren7/G.722.1 the SDP code is different, and there are minor > >> differences in the codec. > > > > Asterisk actually supports both the Siren* and G.722.1* names in SDP > > negotiations. I wasn't aware there were bitstream incompatibilities > > between the Siren* and G.722.1* variants, even though the code may be > > slightly different... so Asterisk uses a single codec module for both > > variants. > > > I am unclear how compatible or incompatible the bitstreams may be. What > I know (from implementing these codecs) is that the source code Polycom > provide licencees, as the basis for developing their own G.722.1 and > G.722.1C codecs, has several comments referring to things not being > quite the same as Siren7/Siren14. However, they don't hand out the > actual Siren7/Siren14 source code, so I don't know how much divergence > there is. > > Steve > > > -- > _____________________________________________________________________ > -- Bandwidth and Colocation Provided by http://www.api-digital.com -- > New to Asterisk? Join us for a live introductory webinar every Thurs: > http://www.asterisk.org/hello > > asterisk-users mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users -- _____________________________________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users