You hvae to use a paket sniffer to verify the RTP stream. Check if IP

Phone (no NAT) send RTP packets to Cisco.

Check if RTP packets from IP Phone arrive at Cisco.

Check logs at Cisco to see if RTP packets are rejected or cause any problems.

Check Cisco access rules - maybe you block all traffic except from the SIP proxy (= RTP proxy). (Try disable all IP access rules and check if it works)

regards klaus

unplug wrote:

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@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@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 daniel@voice-system.ro wrote:

...

Hello,

On 04/18/06 04:39, unplug wrote:

...

Hi, Anyone has experienced an one way audio problem after a call is made? Here is my case. openser1.0.1 + mediarproxy 1.4.2 User behind NAT can make a call without problem. When user with no NAT (direct connect to the internet), one way audio will happen. Anyone can suggest a way to trace the problem.

sniff the network and see if the SDP is SIP messages are right, maybe you misconfigured the proxy and try to do (improper) media relaying for not natted users.

Cheers, Daniel

...

Thanks, unplug

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