[Freeswitch-users] blocking 183 w/o sdp

[Anthony Minessale]

you need sip_ignore_183nosdp=true set on the b leg not the a leg.
Put it in the dial string in {}

{sip_ignore_183nosdp=true}sofia/foo/foo at bar.com


On Fri, Jan 28, 2011 at 12:41 AM, Sam <u2nsam at gmail.com> wrote:
> 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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-- 
Anthony Minessale II

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