[Freeswitch-users] Is there an exmple of "backup provider" ?

[Avi Marcus]

Beware that "low cost provider" may not just reject the call, which you can
recover from, but can mess you up in a large number of ways. Some of which
you can try to work around (debugging + time), some of which you may not be
able to figure out.

   - Not properly passing along DTMF
   - very long PDD
   - FAS fake answers
   - Returning "USER_BUSY" when it's not actually busy
   - Returning "NORMAL_TEMPORARY_FAILURE" when it's actually busy
   - poor audio quality
   - Issues with proxies/re-invite/switching codecs, etc.
   - .. and I'm sure many more.

... Just some of the many issues I've run into when using multiple carriers
and terminating to countries around the world.

-Avi Marcus
BestFone
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