Hi brokeda, thanks for the reply.

Do not think its an issue with the CO line; this relates to external trunk lines, is that correct?

Analog Station will not ring as part of ring group (e.g. "601" dialed from either internal ICM or directed from outside line.

Works fine with direct dialed extension numbers.

I thought the ring groups were set in the Stion Option Tab of the GUI (1802 code). Mine are set to "0" for all stations but ring group 601 still works for the Digital lines