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.
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: Got SIP response 503 "Service Unavailable" back from (ip of call manager) 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. My sip.conf looks like this: [callman] type=friend context=incoming host=(ip of call manager) disallow=all allow=ulaw allow=alaw nat=yes canreinvite=yes qualify=yes I've tried experimenting with the "externip" and "localnet" parameters to no effect. Any ideas?
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