phone bank

Short definition from Wiktionary

Noun

1. 1
   A collection of telephones within an organization such as a call center.
2. 2
   A banking institution that does business solely or mostly via telephone.
3. 3
   A political outreach event or strategy that involves making calls to potential voters by phone to get out the vote or collect voter data.

Verb

1. 1
   To engage in a phone bank (“political outreach event that involves making calls to potential voters by phone”).
2. 2
   Alternative form of phone bank.