[sr-dev] crash with dialog module

[Juha Heinanen]

Alex Balashov writes:

 > The dialog message is also rather ambitious in its aims;  it tackles some
 > rather complicated state-keeping tasks.  Complex design, many possible
 > state permutations, and the need to carefully and precisely manage
 > numerous elements of data persistence in all scenarios in a deductively
 > rigourous way are attributes that result in more bugs as well.

i agree.  dialog module has adopted a very complex task that is not what
a sip proxy is normally supposed to do.

-- juha