Meetme Timing

Hi - I wanted some advice from people on whether a digium card for timing will provide better conference call quality compared to ztdummy on Asterisk 1.2.4.

My conference calls are taken over AIX VOIP channels rather than directly from the PSTN.

I do get some time delay in calls and echo when people are talking from speaker phones.

The box is 3.0 Xeon with plenty of memory.

Cheers -Jon