Hi all,
As far as I can see, there is no caller authentication in SIP ( i.e.
one can initiate calls through SIP Proxies without being registered).
However, to use SIP with IMS in UMTS, there must be a way to authenticate
the caller ( i.e. to verify that the caller is really the one in the FROM
header of the INVITE message). I've read some 3GPP specifications (24.228,
24.229) but I haven't found how they do that. Please help me with this.
Looking forward to hearing from you,
Minh Phan
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