[Freeswitch-users] Why does a SIP forked dial select just the first 183?

Iñaki Baz Castillo ibc at aliax.net
Thu Nov 20 01:13:25 PST 2008

Hi, I read in:
the following:

= Forked dial example =
Forked dial is when you want to attempt to ring 2 destinations at the
same time. Freeswitch will attempt to call both bridge options
simultaneously. The first bridge leg that replies with a 183 (session
progress) message will win the call, and the other bridge leg is
dropped. This only will work with late_negotiation enabled.

While the above could be valid when sending calls to varios (just
two?) PSTN gateways, I wonder why I couldn't send a call to two local
users (200 and 201) and wait until one of them *answers*. My expected
behaviour is:

- I call to FS extension 500.
- FS does a bridge to 200 and 201.
- 200 replies 180 "Ringing"
- 201 replies 183 "Session Progress" with early media (not very common
in a SIP phone but possible anyway)
- After a while 200 replies a 200 OK so FS sends a CANCEL to 201 and
replies 200 OK to the caller.

Is this common behaviour not possible in FS? is there othe way to get
it instead of using "bridge" app with two destinations in "data"?


Iñaki Baz Castillo
<ibc at aliax.net>

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