Hello,

I recently started testing topology hiding module on Kamailio and encountered a problem where B party hangs up, Kamailio can't identify the ongoing transaction to which the BYE should be related to and instead of tearing the call down Kamailio just sends back "481 Call leg/Transaction does not exist" to B party. On Kamailio config I have only enabled the topoh.so -module with default options and configured this to enable masking:
modparam("topoh", "mask_callid", 1)

Here is what the INVITE to B party looks like and the BYE message coming from the B party:
http://pastebin.com/raw/f63zUmid

When debugging on Kamailio end i get:
http://pastebin.com/raw/ZefGAz30

Is this a Kamailio issue or a softphone issue on B party end?

Cheers,

--Olli


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