Using FAX Mode

Chapter 6 Configuring and Debugging Fax Services

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 6-6

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

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 for MGCP (version 3.0)

6-6	OL-4803-01

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.

Configuring the Cisco ATA for Fax Mode

Example

Translation

This setting translates to the bitmap:

OL-4803-01

ATA 188, ATA 186 specifications