They can use a feature code to login and log-out - check the single-line phone manual. A bigger issue is whether they would be considerd by the system as external group members. I believe only one "external" extention is allowed per group. So - it depends on this MultiTech solution - and how the system views the remote extentions.
Tom Daugirdas,
President
STCG, Inc.
stcg.com