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<P>Hi,</P>
<P>My company is a call center and we are using * server for voip calls to america. * server is installed on a dual CPU machine and it is acting as a SIP/IAX2 gateway. SIP protocol is used for agents to connect to * server and * server used IAX2 protocol to connect to our VoIP service provider. There are around 25 agents currently working and making maximum 25 calls simentaneously. Agents are using estara softphone (<A href="http://www.estara.com">www.estara.com</A>) as SIP client. We are making around 4000 calls to america in one day and we are working 7 hours per day. </P>
<P>We are having two kinds of problem in this setup.</P>
<P>1. There are around 10 problems daily that the agent experience a very strong echo.<BR>2. There are around 40 problems daily that the agent can hear the client clearly but the client cannot hear the agent.</P>
<P>My analysis suggests that there are three possible reasons for these problems.</P>
<P>1. Estara Softphone.<BR>2. Our service provider.<BR>3. * server working as a SIP/IAX2 gateway.</P>
<P>We are behind a firewall, I have taken * server outside the firewall but the problems remain the same. I strongly think that * server acting as a SIP/IAX2 gateway is the main cause.</P>
<P>Any clues as to why these problems are arising is highly appreciated. I am willing to do any change to my setup in order to get rid of these problems.</P>
<P>Looking forward to your co-operation.</P>
<P>Regards,</P>
<P>Owais Bin Zubair</P><p><hr size=1><font face=arial size=-1>Do you Yahoo!?<br>
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