We have a phone which has a multicall line button set to ring however it will not ring when the phone is being forwarded.
Even though it will not ring, calls can still be picked up if I happen to notice one is coming through silently.
This phone extension is almost always forwarded to a cellphone, though its important that it rings and is able to pick calls
on other line's while it's is being forwarded.
The particular line in question does not have dedicated phone or IP license and is just a Multicall line key on this particular phone.