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Hi - If the VTech CM18445 only has one active line, then only one extension can be used on a call at a time. Each unit has its own extension number and one extension can transfer a call to another extension. In order to use different extensions at different calls, you need to have more than one active line connected to the main console. If you have other inquiries, please contact VTech Customer Support for further assistance at 1-800-595-9511. We are open from 9:00 AM to 3:00 PM, Mondays through Fridays. When calling, please have your model number handy: CM18445. Thank you! - VTech Support
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