We have recently gotten several complaints about not getting, or severely abbreviated ringback. The first few examples we were able to trace back to a carrier and believe it is because the call sets up with 183 Session Progress w/SDP and <1 second later get a 180 Ringing and the audible ringing stops.
We heard a similar complaint in Europe last with an EU carrier. And again today with yet another US (global) provider. So, my questions are: 1- Anyone else seeing this? If so, what's your workaround/fix? 2- Since this is not contained to a single carrier, anyone aware of an SBC or softswitch maker recently released code that might be causing? Thanks, Pete
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