Hi all,<br><br>I&#39;m testing the integration of OpenSIPS + RTPproxy and I have some doubts:<br><br>1) Is it possible to test a VoIP infrastructure (with OpenSIPS, RTPProxy and IP-phones) in a local network? I&#39;m working on the local network of an university and it&#39;s difficult to me to work with an public IP.<br>

<br>2) Is it possible to chain directly 2 OpenSIPS+RTPProxy solutions (in a local network)?<br><br>IP-Phones &lt;----- sip/rtp -----&gt; OpenSIPS/RTPProxy &lt;----- sip/rtp -----&gt; OpenSIPS/RTPProxy &lt;----- sip/rtp -----&gt; Asterisk<br>

<br>I&#39;m getting some problems in the SDP body of the second OpenSIPS/RTPProxy. I don&#39;t know if this wrong behavior is due to the fact I&#39;m working in a local network and functions liks fix_nated_sdp doesn&#39;t work in this context. Can I modify the SDP body directly with functions like subst_body() (from nathelper module)?<br>

<br>Thanks in advance!<br><br>José M.<br><br><div style="margin: 2em 0pt;" name="sig_93ca30fa1b"><table width="336" border="0" cellpadding="0" cellspacing="0">
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                        <td height="80" valign="top" width="233"><font color="#4e4a49" face="Arial" size="2"><strong>José María Jiménez</strong><br>
                        R&amp;D Engineer <br>
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                        </font> <font color="#4e4a49" face="Arial" size="1">Grupo Gesfor R&amp;D.<br>
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