T1/E1 channels hang?

Hello,

I know that FXo analog ports may some time not detect properly busy signals or hang-ups, so thay may remain open (hang).

Is there a chance that the same may happen with E1 RBS channels or PRI? I didn’t think so as this signalling is digital but I read some postings on mailing lists talking about “stuck” channels on T1/E1’s.

Is there a chance that these phenomena took place because some applications require digital channels to be split to analog via channel banks? (Where digital trunks are not available for example).

Any input would be greatly appreciated.

Thank you,
V.