Fred,
Throwing in B2BUAs is a common recipe for interop problems; one side is liberal in what it
accepts, the other conservative in what it emits. In theory.
For lightweight, signalling-only duty, allow me to suggest SEMS + its 'sbc'
module, though. It gives you a lot of low-level control to solve these kinds of interop
problems, even if not quite as much as something programmable like Kamailio, and it's
a lot less opaque and bureaucratic than Asterisk or Freeswitch. Email me offline if you
want some sample configs, as the community documentation is a little light.
--
Alex Balashov | Principal | Evariste Systems LLC
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