RE: [Sip] why NO sent-by

["Brett Tate" <brett@broadsoft.com>]

> 	But I can not find "sent-by" parameter in 
> draft-ietf-sipping-basic-call-flows-01,
> Why? The RFC uses "MUST" for it.

Please re-look at the Via header syntax within
rfc3261 section 25.1.  The flows do include
the "sent-by" parameter.

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