Odd 17th century phrase which, unless I’ve missed it, OED seems unaware of. According to James Kinsley, a 20th century literary scholar and editor of Dryden’s works, it means invited to participate..
I came across it in Dryden’s Prologue to the King and Queen at the Opening of their Theater (sic). The occasion was the 1682 amalgamation of the King’s and Duke’s players into the new King’s Company.
Here’s the relevant tercet (ll.25-27):
But since the victory with us remains,
You shall be called to twelve in all our gains
(If you’ll not think us saucy for our pains).
As I said, the Yale editor of POAS annotates thus: “Kinsley states that the phrase means invited to participate”.
It’s a strange phrase. Maybe a reference to the Apostles? Have you ever come across it in religious works, oeco?