[asterisk-users] stucked calls in asterisk 1.4

[David Backeberg]

On Wed, May 27, 2009 at 9:26 AM, Stefan Schmidt <sst at sil.at> wrote:
> Server A call it PBX there are the sip clients connected
> A call comes from server B or C to server A and then to a client, gets
> stucked on Server A when PSTN side hangs up. On server B or C the call

You may not have properly configured your card for the way to detect
hangups. If this is going to a proprietary PBX, you may need to change
around the line signaling. Some kinds of line signaling reverse the
polarity on the line voltage to signal a hangup. Other lines don't.
The cheap trick is to try your settings both ways and when one way
works to use that.