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<p>Make a SIP trace with <b>sngrep </b>program and check the
routing of the 486 Busy / 603 Decline message sent by phone B. If
A is still in ringing, it most likely means the reply isn't
reaching it.<br>
</p>
<p>It is possible phone A is behind a NAT and its <i>Via</i> SIP
header needs a small adjustment for the replies to be properly
routed back, using this useful <i>opensips.cfg</i> function call:</p>
<p> <a
href="https://www.opensips.org/Documentation/Script-CoreFunctions-3-5#force_rport">force_rport()</a><br>
</p>
<pre class="moz-signature" cols="72">Liviu Chircu
<a class="moz-txt-link-abbreviated" href="http://www.twitter.com/liviuchircu">www.twitter.com/liviuchircu</a> | <a class="moz-txt-link-abbreviated" href="http://www.opensips-solutions.com">www.opensips-solutions.com</a>
OpenSIPS Summit 2024 Valencia, May 14-17 | <a class="moz-txt-link-abbreviated" href="http://www.opensips.org/events">www.opensips.org/events</a></pre>
<div class="moz-cite-prefix">On 06.04.2024 17:35, Prathibha B wrote:<br>
</div>
<blockquote type="cite"
cite="mid:TYZPR06MB75250B15D61CA897F0AAEFD9FC022@TYZPR06MB7525.apcprd06.prod.outlook.com">User
A makes a call to user B. User B didn't accept the call. User B
stopped ringing after 1 minute. But User A continues to be in the
ringing state until it is manually canceled.</blockquote>
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