Re: [Users] one way audio problem (urgent)

I am troubleshooting the one way audio problem for almost a week but I still find nothing to solve it. I am using mediaproxy as a NAT proxy. I have tried a IP phone with NAT and one without NAT. Below are the combination and the result. call making from one party to another party party A party B 1) IP phone (NAT) <--> PSTN : no problem 2) IP phone (NAT) <--> IP phone (no NAT) : no problem 3) PSTN --> IP phone (no NAT) : no problem 4) IP phone (No NAT) --> PSTN : one way audio problem In case 4, party A speaks but party B hears nothing (no noise & only slient). Party B speaks and party A can hear. First of all, anyone can tell me whether it is the correct information store in location for a non-NAT user. first row is a NAT user and the second row is a non NAT user (received field is null) | username | domain | contact | received | expires | q | callid | cseq | last_modified | flags | user_agent | socket | | 871966629896 | | sip:871966629896@10.0.0.78:5060 | sip:210.184.23.31:5060 | 2006-04-26 17:28:43 | -1.00 | ZpFfQWHzpzbJpyLU(a)10.0.0.78 | 2501 | 2006-04-26 17:28:09 | 1 | KE10XX v4.32.10 00-09-45-0a-fc-7b | 203.193.26.234_5060 | | 871966760539 | | sip:871966760539@218.189.176.170:5060 | NULL | 2006-04-26 17:29:08 | -1.00 | ofFds00mZt1jWFFs(a)218.189.176.170 | 2527 | 2006-04-26 17:28:09 | 0 | KE10XX v4.32.14 00-09-45-0a-fc-29 | 203.193.26.234_5060 | Then, I have compared the log from ngrep but can't find anything special to cause the problem. Below is the log from ngrep for the case 4 that cause one way audio problem. I have compared with other cases above in the section of SDP but nothing found. http://fisher.no-ip.com/ngrep/nonat2pstn1.log Below is the configuration of our system. IP phone (NAT) --- openser --- CISCO --- PSTN --- phone IP phone (no NAT)-----+ As the result shown above and only case 4 has problem. Will the one way audio caused by CISCO? Anyone can help? On 4/18/06, Daniel-Constantin Mierla &lt;daniel(a)voice-system.ro&gt; wrote: