multiple SIP accounts - first full, take next

Hello Guys,
i've got two SIP accounts.
one campaign should use both accounts, is one account full (10 lines), the other SIP account should be used.
any idea or a kind?
thanks
regards
Philip
i've got two SIP accounts.
one campaign should use both accounts, is one account full (10 lines), the other SIP account should be used.
any idea or a kind?
thanks
regards
Philip