I can assure you with 100% certainty (because I worked on such projects for NA and EU) that this is not as bulletproof as you may want. If you're looking to determine if the call is going to be answered by a human, this is not going to work. There are lots of "intelligent services" out there that eventually end up having a human answer, but may have some PROGRESS/early media "stuff" happening before that. I've used the exact same progress description bits you have below.
In the SIP world, I wouldn't really trust 183 for this as some PSTN gateways I've seen send this by default if there is any non-silence (even ringing). David On Thu, Oct 01, 2009 at 11:21:08AM +0200, DE CLERCQ Johan wrote: > Yes it was. In Europe, this is bullet proof ;-) > > > > > Johan De Clercq > > > j.decle...@vocalcom.be > Tel : +32 (0)2 467 82 01 > Fax : +32 (0)2 467 82 10 > Av. Reine Astrid / Koningin Astridlaan 59 > B - 1780 Wemmel > > > ________________________________ > > This e-mail is not legally binding on VOCALCOM SA; the company may only be > committed on the basis of the hand-written signature of one of its authorized > representatives. This message and any attachments are strictly confidential > and intended solely for the addressee. Any unauthorized use or disclosure, in > whole or in part, is prohibited. E-mails are subject to possible alteration. > VOCALCOM and the sender decline any liability if this message and/or any > attachments have been altered, changed or falsified. If you are not the > intended recipient of this message, please delete it and notify immediately > the sender. > ________________________________ > > > -----Original Message----- > From: sip-implementors-boun...@lists.cs.columbia.edu > [mailto:sip-implementors-boun...@lists.cs.columbia.edu] On Behalf Of I?aki > Baz Castillo > Sent: jeudi 1 octobre 2009 11:16 > To: sip-implementors@lists.cs.columbia.edu > Subject: Re: [Sip-implementors] how is answering machine detection > handledinSIP ? > > El Jueves, 1 de Octubre de 2009, DE CLERCQ Johan escribi?: > > I?aki, > > > > Time Stamp : 10/28/2008, 8:44:25.660 > > RECEIVE > > Command=1 SAPI=0x00 > > TEI=0x00 > > 0x02 0xee Information > > Orig=1 CR=0xd38f > > CALL PROGRESS(0x03) > > 1: PROGRESS INDICATOR(0x1e) > > 2: IE Length(0x02) > > 3: 1------- Extension Bit > > -00----- Coding Standard > > ---0---- Spare > > ----0100 Location > > 4: 1------- Extension Bit > > -0001000 Progress Description // inband info is available > > 1: PROGRESS INDICATOR(0x1e) > > 2: IE Length(0x02) > > 3: 1------- Extension Bit > > -00----- Coding Standard > > ---0---- Spare > > ----0100 Location > > 4: 1------- Extension Bit > > -0000010 Progress Description // destination is non isdn > > > > That's how voicemailboxes are detected in isdn. I do not think that this > > is early media. > > > > Sincerelly I don't expect that ISDN defines a response code specific for > voicemailbox. > > In the case you show above, has been the call answered by the voicemailbox > server? > > > > -- > I?aki Baz Castillo <i...@aliax.net> > > _______________________________________________ > Sip-implementors mailing list > Sip-implementors@lists.cs.columbia.edu > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors > > _______________________________________________ > Sip-implementors mailing list > Sip-implementors@lists.cs.columbia.edu > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors > > !DSPAM:4ac4755b91671496857483! > _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
