Dear all,
I have a question regarding From & To header fields in SIP
messages. After reading through the SIP-implementors mailing list archive,
it makes me more confused.
Basically, is it true to say that the 'To' field is never used
in forwarding/sending a request, but the Request URI is used instead?
How about when sending/forwarding a response? Is the 'From'
field used? This is because in the SIP-implementors mailing list for
December, Igor and Vijay answered 'No, never' when answering to this
question 'Is From never considered while sending responses?'. However in
the SIP FAQ, it is mentioned the 'From' field is used for subsequest
requests from the callee to the caller if there is no Contact or Record
Route header. If that applies for subsequent requests, how about for
responses?
Thanks.
Regards,
Victor
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