The original dialed number is supposed to be carried in a diversion header. for example say : A calls B B forwards to C C sends you an invite
you should received an invite with a diversion like Diversion: <[email protected]> reason=unconditional ,; some other parameters Diverssion: <[email protected]>; also you can get one Diversion header with comma separated like Diversion: <[email protected]> reason=busy; more parameters , <[email protected]> ; reason=unconditional; more paramertes so the bottom most it is always the original called number and topmost is the dialed number (current one). take a look at the following draft for details. draft-levy-sip-diversion-08.txt Please also notice the diversion header was never moved to an RFC , rather the History header it is the "official" . however Diversion it is widely implemented. -- alejandro On Thu, May 14, 2009 at 10:43 AM, Lehto, Susan <[email protected]> wrote: > To deliver the number originally dialed, is there an area in the SIP > diversion header to carry the called "telephone number" for delivery to > a voice mail system? > > Our TDM telephone system is optioned to deliver to the voice mail system > the number dialed, so that if the called line forwards to voice mail, > > > > 1. the voice mail system can respond with the called person's greeting > > 2. if the called line forwards to another line, which in turn forwards > to voice mail, the voice mail system can respond with the greeting of > the person originally dialed. > > > > Can SIP achieve the same result? > > We are testing a SIP system, and the vendor does not know of a solution. > > I see that a similar question had been posed on the listserve in October > 2000, but I have not yet found the answer > > Thanks for applying your expertise to this issue. > > > > Susan Lehto > > Sr. Analyst > > Boston University > > [email protected] > > _______________________________________________ > Sip-implementors mailing list > [email protected] > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors > _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
