Chapter 7 Configuring and Debugging Fax Services

Using FAX Mode

Using FAX Mode

Use fax mode when the gateways in the network do not support fax pass-through mode or dial-peer configuration.

You can set one or both lines of the Cisco ATA to G.711-only fax mode. This mode allows the fax machine connected to the Cisco ATA to communicate directly with the far endpoint with no fax signaling event occurring between the two gateways.

This section contains the following topics:

•Configuring the Cisco ATA for Fax Mode, page 7-6

•Configuring the Cisco ATA for Fax Mode on a Per-Call Basis, page 7-7

•Configuring the Cisco IOS Gateway for Fax Mode, page 7-7

Configuring the Cisco ATA for Fax Mode

G.711-only fax mode operation requires configuration of one parameter—AudioMode.

Description

The AudioMode parameter is a 32-bit value. The lower 16 bits apply to the Phone 1 port of the Cisco ATA, and the upper 16 bits to the Phone 2 port. The following is an example of the Phone 1 port of the Cisco ATA configured for G.711-only fax mode:

Example

0xXXXX0012

Translation

This setting translates to the bitmap:

xxxx xxxx xxxx xxxx 0000 0000 0001 0010

•Bit 0 = 0—Disables G.711 silence suppression (VAD).

•Bit 1 = 1—Uses G.711 only, does not user the low bit-rate codec.

•Bit 2 = 0—Disables Fax CED tone detection.

•Bit 4 = 1, Bit 5 = 0—DTMF transmission method: out-of-band through negotiation

•Bit 6 = Bit 7 = 0—Hookflash transmission method: disables sending out hookflash

Note The values XXXX in the example do not apply to the Phone 1 port of the Cisco ATA.

To configure the same value for the Phone 2 port of the Cisco ATA, the value would be 0x0012XXXX. The configuration of one port is independent from the configuration of the other port.

Note The AudioMode configuration overrides the values of the following three parameters: RxCodec, TxCodec, and LBRCodec. For example, if these three parameters are each set to 0 (for G.723), the Cisco ATA would still use G.711 if AudioMode is set to 0x00120012. With this configuration, the Cisco ATA sends both G.711∝-law and G.711A-law as preferred codecs to a peer voice gateway.

Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator’s Guide (H.323)

7-6

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Cisco Systems ATA 188 manual Using FAX Mode, Configuring the Cisco ATA for Fax Mode
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ATA 188 specifications

The Cisco Systems ATA 188 is a versatile Analog Telephone Adapter designed to facilitate the integration of traditional telephone systems with Voice over Internet Protocol (VoIP) networks. This device has been key in bridging the gap between legacy telephony and modern IP-based communication, allowing users to leverage their existing analog phones while enjoying the benefits of digital connectivity.

One of the main features of the ATA 188 is its ability to connect regular analog phones to a VoIP network, enabling users to make and receive calls over the internet. This significantly reduces calling costs, especially for long-distance and international calls. The ATA 188 supports two phone lines, allowing simultaneous voice calls. This dual-line capability makes it a suitable choice for small businesses or home offices that require multiple lines without the need for extensive infrastructure.

The device is equipped with various technologies that enhance its functionality. It supports the Session Initiation Protocol (SIP) and H.323, making it compatible with a wide range of VoIP service providers. Additionally, the ATA 188 features Quality of Service (QoS) settings, which prioritize voice traffic over the internet, ensuring clear voice quality without interruptions or delays. This is essential for maintaining a professional communication experience, especially in business environments.

Another characteristic of the ATA 188 is its user-friendly configuration interface. It allows users to easily set up and manage their devices through a web-based portal. The configuration process is straightforward, with options to adjust settings such as codec selection, call features including call waiting, and call forwarding functionalities.

Security is also a priority for the ATA 188, as it provides robust protocols to protect call data. The device supports Secure Real-time Transport Protocol (SRTP) and Transport Layer Security (TLS) to encrypt voice traffic and manage signaling securely. This ensures that sensitive conversations remain confidential.

Overall, the Cisco Systems ATA 188 is a reliable and efficient solution for users looking to transition from traditional telephony to VoIP. Its dual-line capacity, compatibility with multiple VoIP standards, user-friendly configuration, and built-in security features make it a valuable asset for both personal and professional communication solutions. In an ever-evolving telecommunications landscape, the ATA 188 remains a relevant and practical choice for integrating legacy telephony with modern internet-based services.
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