I'm using VOVIDA B2BUA.

According with its man page it says the following:
"B2bUa is in the call-signalling-path all the times. There are
numerous applications in which b2bUa can be used either as a media
negotiator or simply supervising the calls between two parties."

Its configuration file is very simple only have the following:
<B2BUA_Configuration>
  <SIP>
     <Local>
       <Port>5065</Port>
       <Transport>UDP</Transport>
     </Local>
     <Proxy_Server>
       <Address>200.94.75.6</Address>
       <Port>5060</Port>
     </Proxy_Server>
     <Registration>
       <Register>no</Register>
       <Address>200.94.75.6</Address>
       <Port>5060</Port>
       <Expires>600</Expires>
     </Registration>
  </SIP>
  <RADIUS>
     <Local>
       <Authentication_Port>1812</Authentication_Port>
       <Accounting_Port>1813</Accounting_Port>
     </Local>
    <Billing_Server>
       <Address>200.94.75.11</Address>
       <Authentication_Port>1812</Authentication_Port>
       <Accounting_Port>1813</Accounting_Port>
       <Password>password</Password>
    </Billing_Server>
  </RADIUS>
  <PrePaid>
    <Billing>
       <Option>mandatory</Option>
       <Refresh_Time>20</Refresh_Time>
       <Extract_User_Id_From>Proxy-Authorization</Extract_User_Id_From>
       <User_Id_Decode_Scheme>Basic</User_Id_Decode_Scheme>
    </Billing>
       <Use_SIP_INFO>no</Use_SIP_INFO>
       <Use_HTTP>no</Use_HTTP>
  </PrePaid>
  <Redundancy />
</B2BUA_Configuration>

Regarding the NAT issue I have tested the Linksys with SER and MEDIAPROXY alone and I don't have any problem. I can have the call more than 1 hour and it stills alive.

Regards

Alberto Cruz
Zeus Ng wrote:
Hi Alberto,

I'm not sure how your B2BUA handle private IP in SDP (c=IN IP4
172.31.253.127) from the Linksys UA. The call flow is "fine" (see below) but
the RTP packets is not going through your B2BUA. Normally, the B2BUA shall
rewrite the SDP and carry the RTP packets. In you case, it's not doing so.
The BYE might be sent out by the B2BUA because it does not receive any RTP
packets from Linksys. Thus, it disconnect the call because it thinks the UA
is not responding. Although the call is established, the RTP packets are
between Linksys and Cisco. Please check your B2BUA configuration.

Also, as Klaus said, the call flow is a bit strange. The B2BUA is not
relaying the 183 and 200 responses to SER than Linksys. I'm not sure why
your Linksys is responding to these two responses from the B2BUA, it's
definitely a problem for other NAT routers. I guess your Linksys do have the
problem as it's not responding to the BYE request from B2BUA.

Zeus

  
-----Original Message-----
From: serusers-bounces@lists.iptel.org On Behalf Of Alberto Cruz
Sent: Tuesday, 28 June 2005 1:38 AM
To: Klaus Darilion
Cc: serusers@lists.iptel.org
Subject: Re: [Serusers] Call expires after 30 seconds with 
SER + MEDIAPROXY+VOVIDA B2BUA
Importance: High


Hi Klaus

I'm trying to do the following:

UA behind a NAT ----> SER+MEDIAPROXY --------> B2BUA -----> 
SER+MEDIAPROXY------> PSTN GATEWAY

The first callee is the UA behind the NAT and then the B2BUA calls to 
the PSTN.
The B2BUA has a public IP address (isn't nated)
The PSTN GATEWAY has a public IP address too.
 
I'm attaching the full NGREP sniffing from the call in order 
you can see 
all the flow.

Regards

Alberto Cruz
Klaus Darilion wrote:

    
30 seconds calls are usually an ACK problem due to NAT. 
      
Make sure the
    
callee receives the ACK.

regards,
klaus

Greger V. Teigre wrote:

      
Only B2BUA can generate a BYE, so it's definitely not SER. However,
there may be something else that causes Vovida to generate it. I 
would start in that end. I don't know Vovida, so I wouldn't know 
where to start...
g-)



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