Chapter 3

3

TVP-221H Telephony

Concepts

The TVP-221H enables the transmission of voice and fax traffic over any IP network by digitizing voice and fax signals, encapsulating the information within IP packets, and then sending the packets across the IP network

3.1How the TVP-221H Operates

1.The TIM inside the TVP-221H digitizes analog voice signals at 8 Kbps.

2.TVP-221H system software handles the:

•Capture of telephone number presented as DTMF tones.

•Mapping the telephone number to the IP address of remote VoIP Gateway.

•Setting up calls with remote TVP-221Hs utilizing H.323 call control protocol.

•Digitizing, compressing and encapsulating the voice into IP packets and transmission of the IP packets onto the Ethernet LAN.

3.A router attached to the LAN forwards the IP packets across the WAN, where they will be received by another VoIP Gateway at the remote.

4.The process is reversed at the remote VoIP Gateway.

3.2ATPM

To allow you to easily dial a telephone or fax on the network, the TVP-221H maps a series of dialed digits to the IP address of the remote TVP-221H whose phone or fax you are calling. This mapping information is contained in a database inside each TVP-221H called the dial plan.

Based on the dial plan, the Address Translation and Parsing Manager (ATPM) inside the TVP-221H maps telephony numbers to IP addresses of remote VoIP Gateways. The ATPM collects telephone number dialed by users, decides whether the dial string is part of the dial plan and, if it is, maps it to a remote TVP-221H / TVP-224HR. When the call is set up to the destination, a sub-string of the original dial string will be sent along to the remote VoIP Gateway.

3.3Destination

The destination is where a call is terminated. Typically, for inbound calls from the IP network, the TVP-221H terminals the call at one of the telephony ports. The

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TRENDnet TVP- 221H, VoIP Gateway manual How the TVP-221H Operates, Atpm, Destination
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VoIP Gateway, TVP- 221H specifications

The TRENDnet TVP-221H is a robust VoIP Gateway designed for seamless communication in both residential and small business environments. This device is engineered to facilitate the transmission of voice calls over the internet, leveraging Voice over Internet Protocol (VoIP) technology to enhance communication efficiency and reduce costs associated with traditional telephony.

One of the standout features of the TVP-221H is its dual FXS ports, which allow users to connect standard analog phones or fax machines directly to the gateway. This ensures compatibility with existing equipment, providing a smooth transition from conventional phone services to VoIP solutions. The device supports a wide range of codecs including G.711, G.723, G.726, and G.729, ensuring high-quality, clear voice transmission suitable for various bandwidth requirements.

The TRENDnet TVP-221H also boasts an intuitive web-based interface, making it easy for users to configure and manage their VoIP settings. This feature provides accessibility for remote management, enabling quick adjustments to settings and ensuring that the system is always optimized for performance. In addition, the gateway supports advanced call features such as call waiting, caller ID, and call forwarding, enhancing overall user experience and functionality.

In terms of security, the device incorporates support for SIP TLS and SRTP, providing encryption for signaling and media streams respectively. This ensures that voice communications are kept secure from potential eavesdropping or tampering, critical in today's digital landscape where privacy is a priority.

The TRENDnet TVP-221H is also designed with quality of service (QoS) features to prioritize voice traffic, ensuring smooth call performance even in environments with heavy internet usage. It also supports automatic provisioning and firmware upgrades, simplifying updates and maintenance workflows.

With its compact design, the device can be easily mounted on a wall or placed on a desk, offering flexibility in installation. Its low power consumption and efficient operation also make it an eco-friendly choice for businesses looking to minimize their energy footprint while enhancing communication capabilities.

In summary, the TRENDnet TVP-221H VoIP Gateway is an essential tool for modern communication, providing reliable performance, advanced features, and a user-friendly experience. Its combination of security, call management capabilities, and ease of use makes it a top choice for anyone looking to improve their telephony solutions.
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