[SR-Users] potential PRACK related topos bug

[Juha Heinanen]

Test topology using K 5.4 where topos module is loaded in Proxy1:

   A - Proxy1 - Proxy2 - Proxy1 - B

A sends INVITE, B responds with 183 Session Progress, and A sends PRACK.

The result is that PRACK starts to loop in second Proxy1 instance
instead of being forwarded to B.

If topos module is not loaded in Proxy1, it forwards PRACK to B as it
should.

Also, if Proxy1 loads topos module, but A does not send PRACK, other
in-dialog requests (e.g. BYE) work fine.

-- Juha