[sr-dev] [kamailio/kamailio] topos module may not be able to transparently transmit the update message (#2659)

[Daniel-Constantin Mierla]

The module requires record routing, so if the UPDATE requires to re-enforce Record-Route, then you have to do it. The `404 not here` is sent typically when a request within dialog comes without Route header.

I was aware that only NOTIFY requires to re-enforce Record-Route, but can be also a matter of UA implementation to want it for other requests. Without Record-Route/Route headers in the SIP requests, the topos module does not work.

@buzhaodi - try what @amessina suggested, and if works then we can add to the docs of the module to highlight this case.

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