Hi,
A single sip-adress may be curresponding to multiple physical
entities, as all of them might have registered with the same contact.(Eg:
Your phone, mobile-phone or even your PC client will be registering with ur
adress as contact). In such a case when a call comes to you the proxy may
fork the call and all these instances will get this request, and while
responding the entities put a "tag" in To: field in their response for
identifying them. Also when they send some request in the same call(say BYE)
they uses the same "tag" in the From: field.
Also while initiating a call an entity must put a "tag" in From: when it is
possible that two instances of a user sharing a SIP address can make call
invitations with the same Call-ID.
Hope this clears things...
Cheers,
Philip T Jacob
MindTree Consulting
91-80-6545266
-->-----Original Message-----
-->From: Ravikumar Eswaran [mailto:[EMAIL PROTECTED]]
-->Sent: Tuesday, March 20, 2001 11:50 AM
-->To: Philip T Jacob
-->Cc: [EMAIL PROTECTED]
-->Subject: Re: [Sip-implementors] "tag" Parameter in From Header
-->
-->
-->Hi,
-->
--> What do we mean my "multiple instances of a SIP-URI"?
-->
-->Regard
-->Ravikumar Eswaran.
-->----- Original Message -----
-->From: "Philip T Jacob" <[EMAIL PROTECTED]>
-->To: "Ravikumar Eswaran" <[EMAIL PROTECTED]>
-->Cc: <[EMAIL PROTECTED]>
-->Sent: Tuesday, March 20, 2001 11:34 AM
-->Subject: RE: [Sip-implementors] "tag" Parameter in From Header
-->
-->
-->> Hi,
-->> Tags are used to distuinguish between
-->responses/requests from multiple
-->> instances of a SIP- URI .
-->>
-->> Cheers,
-->> Philip T Jacob
-->> MindTree Consulting.
-->>
-->> -----Original Message-----
-->> From: Ravikumar Eswaran [mailto:[EMAIL PROTECTED]]
-->> Sent: Tuesday, March 20, 2001 11:06 AM
-->> To: [EMAIL PROTECTED]
-->> Subject: [Sip-implementors] "tag" Parameter in From Header
-->>
-->>
-->> Hi,
-->>
-->> When I came across the "tag" parameter in the From
-->header, I cant
-->really
-->> make it how it is used?
-->> Please can someone clarify where we will use this "tag"
-->parameter?
-->>
-->> Regards
-->> Ravikumar Eswaran.
-->>
-->>
-->
-->
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