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Hi </div>
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We are using opensips 2.4.6 at the moment. It's the apt standard(not nightly) repo of debian</div>
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<span>opensips -V<br>
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<div>version: opensips 2.4.6 (x86_64/linux)<br>
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<div>flags: STATS: On, DISABLE_NAGLE, USE_MCAST, SHM_MMAP, PKG_MALLOC, F_MALLOC, FAST_LOCK-ADAPTIVE_WAIT<br>
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<div>ADAPTIVE_WAIT_LOOPS=1024, MAX_RECV_BUFFER_SIZE 262144, MAX_LISTEN 16, MAX_URI_SIZE 1024, BUF_SIZE 65535<br>
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<div>poll method support: poll, epoll, sigio_rt, select.<br>
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<div>main.c compiled on with gcc 6.3.0</div>
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The situation is:</div>
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Our sip server has both IPv4 and IPv6 addresses, it handles IP transit pretty well. Say if there is an incoming call from the gateway A (asterisk IPv4), it can do the IP transit to the destination number registered in IPv6</div>
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A(v4) <=> opensips(v4<=>v6) <=> B(v6)</div>
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<span style="font-family: Calibri, Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255); display: inline !important">We are using $T_fr_inv_timeout to do call forwarding if no answer. The issue here is: </span><span style="color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;">when
the B has a call forwarding setting and if the destination number, let's say C is v4, then the t_relay() of the INVITE after
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$T_fr_inv_timeout seconds results in</span> fail with $retcode -6, I checked the doc it says "generic send failed". I am not too sure what does that means. If both B and C are in v4 only env, then it works without any issue. </span></div>
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<span style="color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;"><br>
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<span style="color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;">A(v4) => opensips(v4/v6) => B(v6) - working</span></div>
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<span style="color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;"><span style="font-family: Calibri, Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255); display: inline !important">A(v4) => opensips(v4/v6)
=> B(v6) => C(v4) - not working</span><br>
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<span style="color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;"><span style="font-family: Calibri, Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255); display: inline !important"><span style="font-family: Calibri, Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255); display: inline !important">A(v4)
=> opensips(v4/v6) => B(v4) => C(v4) - working</span></span></span></div>
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<span style="color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;"><br>
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<span style="color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;">Could you please shed some light on it?</span></div>
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Regards,</div>
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William Jin<br>
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