Chapter 6 Configuring and Debugging Fax Services

Debugging the Cisco ATA 186/188 Fax Services

Possible Causes for Failure

•Fax/modem pass-through option is not enabled on the gateway.

•Fax/modem pass-through NSE payload type are configured differently on the Cisco ATA and the gateway.

Example 6-9 Fax Pass-through Mode Failure

---------- FAX Summary 1

----------

[

37]<2.53=>3.200>

Codec G723

 

[

39]<3.200=>2.53>

Codec G723

 

[

143]<3.200=>2.53>

Codec G711u/D

[

144]<3.200=>2.53>

NSE

PT 100,

EVT 192: Up-Speed, CED tone Detected

[ 1602]<3.200=>2.53>

NSE

PT 100,

EVT 192: Up-Speed, CED tone Detected

[ 1604]<2.53=>3.200>

Codec G711u/D

[ 1820]<2.53=>3.200>

NSE

PT

96,

Cisco Fax Relay

[ 1966]<2.53=>3.200>

NSE

PT

96,

Cisco Fax Relay

Analysis

•<2.53> is the originating gateway, and <3.200> is the terminating Cisco ATA.

•The Cisco ATA upspeeds to G.711µ-law and sends G.711 upspeed NSE signaling packets.

•The <2.53> gateway upspeeds to G.711µ-law and then sends Cisco fax relay event packets.

Possible Cause for Failure

•Cisco fax relay option is not disabled on the gateway.

Example 6-10 Fax Pass-through Mode Failure

---------- FAX Summary 1

----------

 

[

33]<3.200=>2.53>

Codec G729

 

[

39]<2.53=>3.200>

Codec G729

 

[

562]<2.53=>3.200>

NTE

PT 101, EVT

34: Modem Mode, ANSam tone Detected (RFC2833)

[

563]<2.53=>3.200>

NTE

PT 101, EVT

34: Modem Mode, ANSam tone Detected (RFC2833)

[

565]<2.53=>3.200>

NTE

PT 101, EVT

34: Modem Mode, ANSam tone Detected (RFC2833)

[

566]<2.53=>3.200>

Codec G711u/D

 

[

568]<2.53=>3.200>

NTE

PT 101, EVT

34: Modem Mode, ANSam tone Detected (RFC2833)

[

580]<3.200=>2.53>

Codec G711u/D

 

Analysis

•<3.200> is the originating Cisco ATA, and <2.53> is the terminating gateway.

•Both sides initially use G.729.

•<2.53> gateway sends NTE signaling packets, then upspeeds to G.711µ-law.

•<3.200>The Cisco ATA switches to G.711µ-law also, but never sends NTE signaling packets.

•Fax transmission fails because <2.53> gateway does not receive any NTE packets, and it drops the fax call.

Possible Cause for Failure

•The Cisco ATA does not support the NTE signaling method and requires that the gateways use the NSE signaling method.

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

 

OL-4803-01

6-19

 

 

 

Page 136 Page 138
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Image 137
Cisco Systems ATA 188, ATA 186 manual Example 6-9 Fax Pass-through Mode Failure
Page 136 Page 138

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.
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