Hi,<br><br>how can i ignore 183 without sdp,<br>what happens is the provider sends 183 without sdp and by applying &quot;<span>&lt;action application=<span>&quot;set&quot;</span> <span>data</span>=<span>&quot;sip_ignore_183nosdp=true&quot;</span>/<span>&gt;&quot;  the FS sends 180 to the leg a.<br>

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

<br>I have got an advice from Tihomir  to do &quot;execute_on_ring and parse your 180 / 183 messages in search of SDP,<br>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 &quot;<br>
And this could be valid call flow.<br><br>This happens in many cases where the provider is having nextone as a sbc and that too tier 1 !<br><br>Regards<br>Sam<br>