By Jeremy Cioara
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In addition, when combined with a VPN configuration, users can take IP phones home with them and retain their work extension. ■ IP SoftPhones: SoftPhones represent an ideal example of the possibilities when combining voice and data networks. Users can now plug a headset into their laptop or desktop and allow it to act as their phone. SoftPhones are becoming increasingly more integrated with other applications such as e-mail contact lists, instant messenger, and video telephony. ■ Unified e-mail, voice mail, fax: All messaging can be sent to a user’s e-mail inbox.
These services include signaling, digit collection, call routing, setup, and teardown. ■ Trunk: Provides a connection between switches. These switches could be CO or private. ■ Private switch: Allows a business to operate a “miniature PSTN” inside its company. This provides efficiency and cost savings because each phone in the company does not require a direct connection to the CO switch. ■ Digital telephone: Typically connects to a PBX system. Converts audio into binary 1s and 0s, which allows more efficient communication than analog.
Qxd 16 10/9/08 8:33 AM Page 16 CCNA Voice Official Exam Certification Guide Sending Multiple Calls over a Single Line Now, let’s come back to the original problems of analog connections: ■ The signal degrades over long distances. ■ You can’t send multiple calls over a single line (resulting in massive cabling requirements). Digitizing voice solves the first problem because you can easily transmit a numeric value any distance a cable can run without any degradation or line noise. Time-division multiplexing (TDM) solves the second problem.