[OpenSIPS-Users] CSeq and Reinvite

[M S]

Dear Opensips developers,
I have noticed a bug with CSeq handling. When handling ACK, Opensips
uses dlg->legs[x].last_gen_cseq when forwarding it. This causes problems in
the valid case that there is another transaction happening between 200 OK
and ACK (i.e. INFO/OK). In this case, ACK uses CSeq from INFO, which is
incorrect.
I thought of using inv_cseq but inv_cseq always points to the CSeq from the
first invite, so if this happens during reinvite (my case) we cannot use it.
I have 3 solutions and I wonder which one doesn't cause further issues:
1. I update inv_cseq with re-invites (and use it later for ACK)
2. Add a new field (reinv_cseq) to dlg_leg to keep cseq for reinvites and
use it later
3. figure out if I can fix this using cseq_maps (have to look into it)

Ideas are appreciated!
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