<div>Hi,</div>
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<div>I just managed to connect an Asterisk box (1.2.13) to a Nortel CS1000 through SIP.</div>
<div>Thanks to <a href="http://www.voip-info.org/wiki/index.php?page=Asterisk+Nortel">voip-info.org</a> and this <a href="http://bugs.digium.com/view.php?id=8010">patch</a> (8010).</div>
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<div>I now have a working solution, but there still seem to be some compatibility issues.</div>
<div>Here's a scenario: User A calls an extension on the CS1000. The CS1000 sends the extension over SIP to Asterisk.</div>
<div>Asterisk on its turn dials a SIP extension. When this extension answers (User B), an 'INVITE OK' is sent to the CS1000.</div>
<div>The CS1000 wants to ACK this message, but Asterisk says the packet is too old.</div>
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<div>I'm no SIP expert, but it looks like a problem with sequence numbers. Can anybody tell me more, based on this information, if this can be solved in configuration?</div>
<div>Or are we facing a bug in chan_sip.so?</div>
<div>I have include some debug logging for those interested.</div>
<div>All suggestions on how to handle this SIP issue are welcome.</div>
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<div>Regards,</div>
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<div>Koen</div>