[Freeswitch-users] blocking 183 w/o sdp

[Sam]

 Hi,

how can i ignore 183 without sdp,
what happens is the provider sends 183 without sdp and by applying "<action
application="set" data="sip_ignore_183nosdp=true"/>"  the FS sends 180 to
the leg a.
Here i want to block the 183 with SDP just like router as b2bua and send
nothing to leg a, and when actual 183 with sdp comes it should send .

Its because, providers are sending false signaling by sending 183 without
sdp,and it hampers while @ production,
Although by cisco sbc i have done this but i want to do it by FS,
Take a scenario, when call is send 183 without sdp for 10 secs and then
followed by 183 with sdp ( actual signal),
but when some one dials invalid number it rings for 10 secs and then gives
SIP cause 404, which is bad from the providers.
So this is the reason i want to block it.

Most of the providers do this, the way out is blocking.

I have got an advice from Tihomir  to do "execute_on_ring and parse your 180
/ 183 messages in search of SDP,
once you get 183 without SDP do not send it back to leg a and send signal
only when you got 183 with sdp or 180 "
And this could be valid call flow.

This happens in many cases where the provider is having nextone as a sbc and
that too tier 1 !

Regards
Sam
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