I have Asterisk 1.4 tied via SIP to a Cisco Callmanager 6.1 system. Calls between the systems (ie. extension to extension) work perfectly.<br><br>However when I attempt to make an outside call from an Asterisk extension through Call Manager to the outside world, it connects but only for a few seconds, and on the Asterisk console I get:<br>
<br>Got SIP response 503 "Service Unavailable" back from (ip of call manager)<br><br>Coming the other way, if I call into the Call Manager system (from my cell to be exact), then transfer my call to the Asterisk SIP phone (an Aastra 57i), on the cell I can hear the voice on the Aastra, but the Aastra can only hear the Asterisk music on hold! As I mentioned though, going the other way and calling out from Asterisk to my cell works perfectly...for between 5 and 10 seconds (it varies), then disconnects with the above error.<br>
<br>My sip.conf looks like this:<br><br>[callman]<br>type=friend<br>context=incoming<br>host=(ip of call manager)<br>disallow=all<br>allow=ulaw<br>allow=alaw<br>nat=yes<br>canreinvite=yes<br>qualify=yes<br><br>I've tried experimenting with the "externip" and "localnet" parameters to no effect.<br>
<br>Any ideas?<br><br>