A CID group is a pool of DIDs your campaign rotates through when placing calls. Local-presence rotation matches the caller-ID area code to the prospect's area code, typically lifting contact rate 20-30%.
Creating a CID group
Admin → CID Groups → New. Pick a rotation strategy: round-robin, random, local-presence (area-code-matched), or weighted (based on DID health score). Drag DIDs into the group.
Assigning to campaigns
Campaigns → [campaign] → Caller ID → Pool. Pick the CID group. Every dial on this campaign now uses the rotation you defined.
Watch for burning DIDs
Even with rotation, heavy outbound volume can spam-flag DIDs. The CID group health view shows flagged numbers, rotate them out and swap in fresh ones.