Using prserv for Diagnosing Fax Problems

Chapter 6 Configuring and Debugging Fax Services

Debugging the Cisco ATA 186/188 Fax Services

Table 6-1 Solving Common Fax Problems (continued)

Problem	Action

The Cisco ATA is not	Cisco recommends using software version 2.14 or higher.
loaded with the proper
software.

User is operating	Cisco recommends using Cisco ATA models 186-I1, 186-I2, 188-I1, or
Cisco ATA software on an	188-I2 (hardware platforms).
outdated model.

The Cisco ATA is not	For fax mode, the AudioMode configuration parameter should be set to
configured for fax mode or	0xXXXX0012 (X = value not applicable) for the Phone 1 port of the
fax pass-through mode.	Cisco ATA, and 0x0012XXXX for the Phone 2 port.
	For fax pass-through mode, AudioMode should be set to 0xXXXX0015
	for the Phone 1 port of the Cisco ATA, and 0x0015XXXX for the Phone
	2 port.

The remote gateway is not	When the Cisco ATA is configured for fax pass-through mode, all remote
configured for modem/fax	gateways must be configured with modem/fax pass-through mode either
pass-through mode.	on a dial-peer level or system level.

Fax relay is not disabled	Fax relay is enabled by default on some Cisco gateways. When fax relay
on the remote gateway.	is enabled, it can override fax pass-through mode and cause fax failure.
	Examples of the CLI commands to disable fax relay for IOS gateways are
	as follows:
	• fax rate disable for H.323/SIP gateways
	• mgcp fax t38 inhibit for MGCP gateways

Fax/modem pass-through	Some Cisco gateways (such as Cisco VG248, and Cisco 6608) may use
method on the remote	signaling messages based on RFC2833 for G.711 upspeed when loaded
gateway is not compatible	with older software images. This method is incompatible with the Cisco
with the Cisco NSE-based	NSE-based method.
method.	You must check to make sure that the image on your gateway supports the

	Cisco NSE-based fax/modem pass-through. Otherwise, you must
	configure the Cisco ATA to use fax mode.

NSE payload types differ	The Cisco ATA has a configurable NSE packet payload-type value whose
between gateways.	default is 100. This value is compatible with the implementations of most
	Cisco gateways. However, some Cisco gateways use 101 as the NSE
	payload type.
	Ensure that all gateways in your environment use the same NSE payload
	type if you wish to successfully use fax pass-through mode.

Using prserv for Diagnosing Fax Problems

This section contains the following topics:

•prserv Overview, page 6-9

•Analyzing prserv Output for Fax Sessions, page 6-9

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

6-8	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.

Cisco Systems ATA 186, ATA 188 manual Using prserv for Diagnosing Fax Problems, Port

Models: ATA 188 ATA 186

Problem

Action

fax pass-through mode.

Cisco ATA, and 0x0012XXXX for the Phone 2 port.

For fax pass-through mode, AudioMode should be set to 0xXXXX0015

2 port.

pass-through mode.

on a dial-peer level or system level.

• mgcp fax t38 inhibit for MGCP gateways

Using prserv for Diagnosing Fax Problems

•prserv Overview, page 6-9

•Analyzing prserv Output for Fax Sessions, page 6-9

OL-4803-01

ATA 188, ATA 186 specifications