Tadiran Telecom Coral SeaBeam Installation And Configuration Reference Manual page 54

Coral SeaBeam Installation and Configuration Manual
When multiple accounts are enabled, you will be able to receive calls on all
those accounts.
You can never place a call on a disabled account even if you enter the account
prefix. Placing such a call will fail, with the Not found message
appearing.
You can never receive a call on a disabled account. If another party calls you
on a number that is only known to a disabled account, the call will never
appear on your phone.
When multiple accounts are enabled, the account to use for an outgoing call is
determined as follows:
If you enter the account prefix before the number (for example, #1 for the
first account) then that account is used.
If you have set up dial plans, then the rules of the dial plan determine
which account is used.
If you have not set up any dial plans, then the default account is used.
Setting the Default Account
When multiple accounts are enabled, one account is always the default. You can set
any account as the default account by selecting the account and clicking the Make
Default button.
The dial plan rules might select the default account and might be selected by Coral
SeaBeam to use to place an outgoing call, as described above.
Configuring the Coral SeaBeam 49