Nortel Networks M3900 Key-based Expansion Module provides 22 keys for any combination of lines and features. The M3904 and M3905 each support up to two expansion modules, for a total of 44 additional keys.
Nortel Networks M3900 Key-based Expansion Module provides 22 keys for any
combination of lines and features. The M3904 and M3905 each support up to two
expansion modules, for a total of 44 additional keys.
