Call forwarding to answering machine for all lines

[cbt-adrian]

My client had a very old PBX system when they can dial *72 followed by the number that is being forwarded. How can I set this up when I can enable call forwarding with one phone for all lines. We are using t54w yealink phones and I see it has the call forwarding feature. When enabling it, it only forwards from that phone and not all phones. Do I need to create a shared group line then this will enable all call forwarding out? I read on a forum that when enabling calling forward the yealink is by default set to all lines. We need to allow my client to set it when ready due to the inconsistent business hours. I cant just set a set time for them. Anybody have dealt with this setup before?