'[Freeswitch-dev] Sofia SIP: Addresses c= and o= changed when sending INVITE with 0.0.0.0'

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List:       freeswitch-dev
Subject:    [Freeswitch-dev] Sofia SIP: Addresses c= and o= changed when sending INVITE with 0.0.0.0
From:       "Huang, Kun-Yao" <kxhuan () dolby ! com>
Date:       2016-10-20 0:08:07
Message-ID: D42E5643.DC3B%kxhuan () dolby ! com
[Download RAW message or body]

Hello all,

I've seen this asked a long time ago here but I could not find an answer, so trying \
again.  I realise this is the old way of putting a call on hold, but why does \
sofiasip automatically change my origin and media IPs?

When the address is "0.0.0.0", sofia sip changes it silently, after calling \
"soa_check_sdp_connection" from "offer_answer_step", while processing the o= and c= \
fields before sending the INVITE.

I am just wondering why does "soa_check_sdp_connection" check for "0.0.0.0" as \
invalid, when some systems out there still use this address to signal that the call \
is on hold:

int
soa_check_sdp_connection(sdp_connection_t const *c)
{
  return c != NULL &&
    c->c_nettype &&c->c_address &&
    strcmp(c->c_address, "") &&
    strcmp(c->c_address, "0.0.0.0") &&
    strcmp(c->c_address, "::");
}

Thanks,
Kun-Yao Huang

[Attachment #3 (text/html)]

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<body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: \
after-white-space;"> <div>
<div><font face="Calibri,sans-serif">Hello all,</font></div>
<div><font face="Calibri,sans-serif"><br>
</font></div>
<div><font face="Calibri,sans-serif">I&#8217;ve seen this asked a long time ago here \
but I could not find an answer, so trying again. &nbsp;I realise this is the old way \
of putting a call on hold, but why does sofiasip automatically change my origin and \
media IPs?</font></div> <div><font face="Calibri,sans-serif"><br>
</font></div>
<div><font face="Calibri,sans-serif">When the address is &#8220;0.0.0.0&#8221;, sofia \
sip changes it silently, after calling &#8220;soa_check_sdp_connection&#8221; from \
&#8220;offer_answer_step&#8221;, while processing the o= and c= fields before sending \
the INVITE.</font></div> <div><font face="Calibri,sans-serif"><br>
</font></div>
<div><font face="Calibri,sans-serif">I am just wondering why does \
&#8220;soa_check_sdp_connection&#8221; check for &#8220;0.0.0.0&#8221; as invalid, \
when some systems out there still use this address to signal that the call is on \
hold:</font></div> <div><font face="Calibri,sans-serif"><br>
</font></div>
<div><font face="Calibri,sans-serif">int</font></div>
<div><font face="Calibri,sans-serif">soa_check_sdp_connection(sdp_connection_t const \
*c)</font></div> <div><font face="Calibri,sans-serif">{</font></div>
<div><font face="Calibri,sans-serif">&nbsp; return c != NULL &amp;&amp;</font></div>
<div><font face="Calibri,sans-serif">&nbsp; &nbsp; c-&gt;c_nettype \
&amp;&amp;c-&gt;c_address &amp;&amp;</font></div> <div><font \
face="Calibri,sans-serif">&nbsp; &nbsp; strcmp(c-&gt;c_address, &quot;&quot;) \
&amp;&amp;</font></div> <div><font face="Calibri,sans-serif">&nbsp; &nbsp; \
strcmp(c-&gt;c_address, &quot;0.0.0.0&quot;) &amp;&amp;</font></div> <div><font \
face="Calibri,sans-serif">&nbsp; &nbsp; strcmp(c-&gt;c_address, \
&quot;::&quot;);</font></div> <div><font face="Calibri,sans-serif">}</font></div>
<div><font face="Calibri,sans-serif"><br>
</font></div>
<div><font face="Calibri,sans-serif">Thanks,&nbsp;</font></div>
</div>
<div><font face="Calibri,sans-serif">Kun-Yao Huang</font></div>
</body>
</html>

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