switching to second line automatically....

Hey,
We are using Vicidial with Asterisk to make calls to US, with Digium TE410P card. There are 3 PRI lines connected to it. As one PRI provides only 23 channels, when one line becomes full we need the second line to be used by Vicidial. Is there a way that we can do this automatically? We tried changing the Outbound call Groups in Admin --> Show phones --> 8540 --> Outbound call Group to /zap/g3 (user level). But the call is going only through the TRUNK specified in extensions.conf. Is there a solution for the automatic switching? Thank you in advance.
Regards,
Kurian.
We are using Vicidial with Asterisk to make calls to US, with Digium TE410P card. There are 3 PRI lines connected to it. As one PRI provides only 23 channels, when one line becomes full we need the second line to be used by Vicidial. Is there a way that we can do this automatically? We tried changing the Outbound call Groups in Admin --> Show phones --> 8540 --> Outbound call Group to /zap/g3 (user level). But the call is going only through the TRUNK specified in extensions.conf. Is there a solution for the automatic switching? Thank you in advance.
Regards,
Kurian.