Thomas Gelf writes:
Nonetheless I agree with Taisto - if one branch is telling me that he can provide me a definitive answer for his point of view this doesn't have to be something I can trust while forking, do I?
rfc3261:
If a 6xx response is received, it is not immediately forwarded, but the stateful proxy SHOULD cancel all client pending transactions as described in Section 10, and it MUST NOT create any new branches in this context.
-- juha