Hi Bogdan,
Yeap, I've already figured it out by experimenting. Thanks a lot for clarification. I couldn't find clear description of this tm module behavior anywhere in documentation or on the web. I think it's worth to put your replies in this thread in FAQ/documentation/etc. I find it quite confusing figuring it out on your own.
Michael
On Wednesday 27 July 2005 12:03 pm, you wrote:
Hi Michael,
what to do with broken hop-by-hop ACKs ? :) just drop them, otherwise they will loop on the server.
t_newtran() basically creates a new transaction. If it's ACK and it matched to an INVITE transaction, it will be silently discarded (so function will never return to script). If ACk doesn't match, the function will return; so after t_newtran() you will have only unmatched ACKs filtered out.
so,
..... if (is_method("ACK")) { #hop-by-hop ACKs are absorbed here t_newtran(); # drop broken ACKs exit; } ......
should be ok.
regards, bogdan
Michael Ulitskiy wrote:
Bogdan,
Thanks a lot. Your replies are very useful. Just couple more questions raised by comments. What would I want to do with broken ACKs? I thought I'd just drop it. Also how would I distinguish them? I don't really understand how you use t_newtran(). Don't real ACKs still need to hit t_relay to finish transaction? I thought about something like the following, but so far couldn't find a way to determine if ACK is matching transaction or not:
if (is_method("ACK")) { #hop-by-hop ACKs are absorbed here if (in-transaction ACK) { t_relay(); } # lost ACKs are dropped # ....... exit; }
I've tried to t_lookup_request() to check if it's in transaction, but it didn't work. Could you please comment on it? Thanks,
Michael
On Tuesday 26 July 2005 06:55 am, you wrote:
Hi Michael,
that's ok. only two comments:
- all ACKs are in-dialog: ACKs for negative replies are hop-by-hop and
are the one absorbed by tm functions; the ACKs for 2xx replies are end-to-end and are Route driven. 2) since you may have hop-by-hop ACKs (no route) which doesn't match any transaction (broken or lost ACKs), if you want to deal with them separately, do like this:
if (loose_route()) { #end-2-end ACKs are forwarded here #do something t_relay(); exit; } if (is_method("ACK")) { #hop-by-hop ACKs are absorbed here t_newtran(); # deal with broken / lost ACKs # ....... exit; }
regards, bogdan