One solution to that and your other problems, would be to use the P-Asserted-Identity header for this purpose. (draft-ietf-sip-asserted-identity-02.txt). In addition to providing a way to solve the authentication problem, it permits you to have multiple asserted identities. So your caller could have both a sip: address and a tel: address. Presumably the gateway would use the tel: address, while a sip UAS might prefer to present the sip: address to the callee.
Of course this won't work in isolation - it will only work in a deployment where all the parties agree to use P-Asserted-Identity.
Paul
Maria Yndefors wrote:
Hi! The caller presentation is a widly used service in the PSTN network, and ofcource IP telephony users will want to have the same service even if they are calling from the IP world to the PSTN. Yes, the gateway will have some numberseries, and also each user of the IP telephony network will have its own phonenumber, so that they can be reach from the PSTN. We don't want to present the gateway number to the called party, but the actual number where the caller can be reached.We are developing a gateway and I am interested in how others have solved this problem. Regards Maria -----Original Message----- From: James Undery [mailto:[EMAIL PROTECTED]] Sent: Thursday, December 19, 2002 2:44 PM To: Maria Yndefors Subject: RE: [Sip-implementors] phone number to be contacted at This is exactly the complexity I means, in reality a SIP UA won't have a phone number and the callee will see the gateway as the caller-id. Unless you've got gateway controlling a range of number and a proxy the otherside handling the location within that range you wouldn't be able to call from the PSTN. The otherway round you'd need an extension on the gateway so that you could tell it which of its numbers to use. (You'd have to see gateway vendors about this if it exists.) James-----Original Message----- From: Maria Yndefors [mailto:[EMAIL PROTECTED]] Sent: 19 December 2002 13:33 To: James Undery; Sip-Implementors Subject: RE: [Sip-implementors] phone number to be contacted at Hi! Thanks for answering, the thing is that the useragent might not put its phonenumber in the From, it will perhaps put maria@e-horizon, and not [EMAIL PROTECTED], otherwise other IP phone also will have call [EMAIL PROTECTED] when they call back to [EMAIL PROTECTED], why should a IP phone have to use the phonenumber when it could just use the more simpler [EMAIL PROTECTED], So what I'm looking for is some alternate From field, to put the phonenumber in. /Maria -----Original Message----- From: James Undery [mailto:[EMAIL PROTECTED]] Sent: Thursday, December 19, 2002 2:15 PM To: Maria Yndefors; Sip-Implementors Subject: RE: [Sip-implementors] phone number to be contacted at Hi, I guess no one answered as you've more or less answered it your self, the From header would be used if anything was (if it was a tel uri or equivalent). As you can probably guess though this is far more complex than that as the gateway is likely to present it's own number due to regulations about tracability and the possibility for spoofing. James -----Original Message----- From: Maria Yndefors [mailto:[EMAIL PROTECTED]] Sent: 19 December 2002 13:05 To: Sip-Implementors Subject: [Sip-implementors] phone number to be contacted at Hi! I have asked similar question before but I did not get an answer so I will try again. When an useragent calls through a gateway out to the PSTN it will send a sip address with user@host in the From header field (the same address it used to register itslef with), What header field could be used if the UA would like to send its phonenumber, so that it can be displayed to the called party. Thanks and Regards Maria_______________________________________________ Sip-implementors mailing list [EMAIL PROTECTED] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
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