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MWM - The VTech CM18445 has telephone ports at the back of the unit labeled L1/L2 port and L3/L4 port wherein you can directly connect the telephone cords to and have all the four lines available on the unit. 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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