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Solution draft – History-Info – Index Example B is serial forking first to C then to D. C is parallel forking. A ? B ? C ? E | \ ? F | \? D ? G A sends INVITE targeted to B. HI: B, n=1. B retargets to C. HI: B, n=1; C, n=1.1 is sent in INVITE and response to A. 3) C parallel forks to E and F. HI: B, n=1; C, n=1.1; E, n=1.1.1 sent in INVITE to E and response to B,A HI: B, n=1; C, n=1.1; F, n=1.1.2 sent in INVITE to F and response to B,A 4) both branches of fork to C fail. B retargets to D with the following History Info entries: HI: B, n=1; C, n=1.1; E, n=1.1.1; F, n=1.1.2; D, n=1.2 |