MD110<-TDM->PSTN to IP gateway<- Wired Ethernet->Wireless Gateway<-Wireless->Wireless Gateway<-Wired Ethernet->IP to PSTN gateway <-PCM->BP250.
When a voice conversation is converted into IP there are two speech streams transported by RTP. In the example given there are 4 streams for the two conversations. The first goal is to figure out where this 'cross talk' occurs. The best way is to use a network sniffer on the wired Ethernet and wireless sections and capture the RTP streams at each point. A couple good analyzers are Ethereal http://www.ethereal.com and the one from Clearsight networks .
After performing this analysis, you should be able to figure out if the problem is with the wireless devices or the PSTN gateways. It is unlikely a configuration problem. It is more likely a bug in the software of one of the devices that is causing the problem.
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