Instruction: Extract the value of the target attribute from the given product information and output it along with the corresponding source.

Input:
Product title: AT&T 4 Handset DECT 6.0 Cordless Phone with Answering System and Dual Caller ID + Call Waiting
Product description: 4 handset cordless answering system with dual caller ID/call waiting.
Product feature: Unsurpassed range, Caller ID announce, HD audio, Extra large display, Big buttons
Product brand: ATT
Target attributes: Number of Lines
Answer: attribute: number of lines
value: None
source: None