The setup we’ve been using for awhile now has been great, but within the past few days, when calling the phone number, we’ve been getting a busy signal. It may last for 5 minutes or less, then clears up and seems to be fine for an hour or less then starts again. At first we were using IAX through Teliax, but were encountering a similar problem. Tech support suggested switching to SIP and switching the codec to ULAW instead of GSM. The codec switch helped the call quality incredibly, but we’re still having this busy signal issue. Is there anything with Asterisk that could cause this? Or anything in the sip.conf or extensions.conf file that could do this? Or would a busy signal indicate a problem on Teliax’s side?
Asterisk is running on Debian Sarge on a Pentium II with 256MB RAM connected to a 3MB/896k Qwest DSL connection with a static IP.