Hi all,

I have some questions about how a B2B should behave.
The scenario is : A - proxy 1 - B2B - proxy 2 - B

1) Should all fields be kept from the incoming request to the new request
sent out (in the B2B). I will remove (or change) via-list, call-id,
record-route and contact. All other headers, should they be kept? As an
example we can take the User-Agent sent from A via proxies and B2B to B.

2) When B sends BYE, is the B2B supposed to answer with 200 OK or sould it
forward the BYE first and wait for a 200 OK from A before it sends the 200
OK back to B

And in the end a short question about 407 authentication. If A sends Invite
to a proxy where it has to authenticate itself, is it OK or not OK for the
proxy to first send 100 Trying and then send 407? As I understand it, it is
OK according to the RFC since the first is a provisional response and the
second a final response. Just want to check with you since I have never seen
this behavior before.

Thanks in advance!

// Andreas

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