Cadence with Three On-Off Pairs | Cisco Systems ATA 188, ATA 186

Chapter 5 Parameters and Defaults

Tone Configuration Parameters

•NumOfFreqs is the number of frequencies in the tone (1, 2, or 3). The frequencies can play simultaneously or sequentially, depending on the Sequential setting.

•TFreq1, TFreq2, and TFreq3 are the transformed frequencies of the first, second, and third frequencies, respectively. Calculate each value with the following formula:

32767 * cos (2 * pi * F/8000)

where F is the desired frequency in Hz. Set this value to 0 if the frequency does not exist. The range of each value is –32768 to 32767.

For negative values, use the 16-bit 2’s complement value. For example, enter –1 as 65535 or as 0xffff.

•Tamp1, Tamp2 and Tamp3 are the transformed amplitudes of the first, second and third frequencies, respectively. Their values are calculated with the following formula:

32767 * A * sin(2*pi*F/8000)

A (amplitude factor) = 0.5 * 10^((k+10-(n-1)*3)/20)

where F is the desired frequency in Hz, k is the desired volume in dBm, and n is the number of frequencies (If Sequential is set to 101, n is equal to 1). The ^ symbol means to the order of.

•NumOfOnOffPairs is the number of on-off pairs in the cadences of the tone (0, 1, 2, or 3). For a steady tone, use 0.

If this value is 0, the OnTime1, OnTime2, OnTime 3, OffTime1, OffTime2, and OffTime3 values must also be 0.

•OnTime1, OnTime2, and OnTime3 are the lengths of time that the first, second, and third on-off pairs of a cadence play a sound, respectively. (See Figure 5-2for a graphical representation.)

Specify each value as a number of samples with the sampling rate of 8 kHz. The range of each value is 0 to 0xffff.

For example, for a length of 0.3 seconds, set a value to 2400.

•OffTime1, OffTime2, and OffTime3 are the lengths of silence after the sound of the first, second, and third on-off pairs of a cadence, respectively.

Specify each value as a number of samples with the sampling rate of 8 kHz. The range of each value is 0 to 0xffff.

For example, for a length of 0.3 seconds, set a value to 2400. (See Figure 5-2for a graphical representation.)

Figure 5-2 Cadence with Three On-Off Pairs

Sound

OnTime_1

OnTime_2

OnTime_3

Silence

OffTime_1

OffTime_2

OffTime_3

99267

•NumOfRepeats is the number of times that the first on-off pair of the cadence (specified by OnTime1, OffTime1) repeats before the second on-off pair (specified by OnTime2, OffTime2) plays.

For example, if NumOfRepeats is 2, the first on-off pair will play three times (it will play once and then repeat two times), then the second on-off pair will play.

Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator’s Guide for MGCP (version 3.0)

	OL-4803-01	5-33

ATA 188, ATA 186 specifications

The Cisco Systems ATA 186, or Analog Telephone Adapter, revolutionized the way traditional telephony interacted with Voice over Internet Protocol (VoIP) systems. Designed primarily for home and small office use, the ATA 186 allows users to connect standard analog phones and fax machines to a network, enabling them to take advantage of the benefits of VoIP technology.

One of the defining features of the ATA 186 is its dual port architecture. It includes two FXS ports, allowing users to connect up to two analog telephones. This functionality means that multiple devices can leverage VoIP services simultaneously without the need for separate adapters for each phone. The flexibility of the ATA 186 helps streamline the user experience, facilitating voice communication over an IP network while ensuring users can still use their existing phone equipment.

The ATA 186 employs various technologies to maintain high-quality voice calls. It supports standard voice codecs such as G.711 and G.729, which ensure efficient bandwidth usage while preserving call clarity. The adaptive jitter buffer technology further enhances call quality, compensating for network variations and minimizing latency, which is crucial for clear and uninterrupted conversations.

Additionally, the ATA 186 provides users with advanced calling features that were traditionally available only on PBX systems. These features include caller ID, call waiting, and voicemail functionality, integrating seamlessly with typical telephony services. The device also supports T.38 fax relay, allowing users to send and receive faxes over the internet, thus addressing the needs of environments where fax communication remains essential.

The security of VoIP conversations is also a priority for the ATA 186. It employs encryption protocols such as Secure Real-time Transport Protocol (SRTP) and Transport Layer Security (TLS), ensuring that voice data is securely transmitted across the network. This focus on security helps protect sensitive information transmitted during calls.

Installation and configuration of the ATA 186 is streamlined, with an intuitive web-based interface that simplifies the setup process. This accessibility makes it suitable for users with varying levels of technical expertise, as frequently required adjustments, such as network configurations and firmware updates, can be easily managed.

In conclusion, the Cisco Systems ATA 186 stands out as a versatile and robust solution for users looking to integrate analog phones into a VoIP environment. With its dual port capabilities, high-quality voice codecs, advanced call features, and security measures, it offers a compelling choice for both residential and commercial users seeking seamless telephony integration. As technology evolves, devices like the ATA 186 remain cornerstones in bridging traditional telephony with modern communication systems.