[SR-Users] loose_route false when using topos? At which point in the call flow, does topos restore the Route header?

Hi

https://lists.kamailio.org/pipermail/sr-users/2020-July/109801.html

I have the exact same issue.

When the B side is starting a new transaction (UPDATE to refresh the session in my case) without topos enabled, that transaction contains one or multiple route header and a to_tag.

Therefore loose_route() is true and the call is more or less sent to route(RELAY) immediately without further checks.

If topos is enabled, all record-route header are removed and only one Via sent to the CPE. So when the CPE replies, there is no Route header. Therefore loose_route returns false.

This makes me wonder, at which stage is topos restoring the route headers? Shouldn't that happen before loose_route is evaluated?

Mit freundlichen Grüssen

-Benoît Panizzon-