<div>I have a customer with a Polycom 501 phone behind a NAT. His phone is connected to his Netgear router at home which in turn is connected to his cable modem. The phone is set up to register with our remote Asterisk server which is on a public, static IP address, with no NAT.
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<div>If we set qualify=yes, our Asterisk console shows his extension becoming UNREACHABLE for a minute, then REACHABLE for a minute, then UNREACHABLE again, in an endless cycle. If we try to call the phone while it is UNREACHABLE, the phone never rings and the call goes straight to voice mail. This is very annoying.
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<div>If we set qualify=no, then if we try to call the phone, the phone sometimes does not ring at all, and we hear silence. The call eventually goes to voice mail. This is equally annoying to the customer.</div>
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<div>What is the solution to this problem? We have other customers with Polycom phones behind NAT, and they don't have this problem. Will we have better luck if we replace the Polycom with a Linksys 942 phone? </div>
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<div>Here is some console output:</div>
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<div>Jul 16 21:44:24 NOTICE[19981]: chan_sip.c:11364 sip_poke_noanswer: Peer '280' is now UNREACHABLE! Last qualify: 174<br>Jul 16 21:45:33 NOTICE[19981]: chan_sip.c:9697 handle_response_peerpoke: Peer '280' is now REACHABLE! (3181ms / 5000ms)
<br>Jul 16 21:47:37 NOTICE[19981]: chan_sip.c:11364 sip_poke_noanswer: Peer '280' is now UNREACHABLE! Last qualify: 175</div>
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<div>Here is the way the phone is set up in sip.conf:</div>
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<div>[280]<br>type=peer<br>username=280<br>secret=280<br>host=dynamic<br>dtmfmode=rfc2833<br>callerid="John" <280><br>context=company_x<br>mailbox=280<br>nat=yes<br>canreinvite=no<br>qualify=5000<br><br>We are using Asterisk
1.2.5 with standard .conf files. We are not using realtime or databases. Any help would be highly appreciated. </div>
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<div>Rana Dutt</div>
<div>Softel Solutions</div>
<div><a href="mailto:rdutt@softelinc.com">rdutt@softelinc.com</a></div>
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