Chapter 7 Configuring and Debugging Fax Services

Debugging the Cisco ATA 186/188 Fax Services

•------------ Summary --------------

Input file: faxpassthru.cap

<00.723>: (G723) 2.213:10000 => 2.116:10002

total 38 pkts(70 frames), lost 0 pkts, fill 7 silence pkts

This indicates that the input filename is faxpassthru.cap. The output file 00.723 contains the G.723-compressed stream from <2.123:10000> to <2.116:10002>; 38 packets (70 frames) were processed by rtpcatch. No lost packets were detected and seven silence packets were found.

•---------- FAX Summary 1 ----------

[

25]<2.213=>2.116>

Codec G723

 

[

26]<2.116=>2.213>

Codec G723

 

[

101]<2.116=>2.213>

Codec G711u/D

 

[

102]<2.116=>2.213>

NSE PT 100, EVT 192: Up-Speed,

CED tone Detected

[

103]<2.116=>2.213>

NSE PT 100, EVT 193: ECAN OFF,

Phase Reversal Detected

[

105]<2.213=>2.116>

NSE PT 100, EVT 192: Up-Speed,

CED tone Detected

[

107]<2.213=>2.116>

Codec G711u/D

 

This indicates that the audio streams originating at <2.213> and <2.216> are G.723-compressed. The audio stream from <2.116> was then up-sped to G.711µ-law at packet number 101. The NSE signaling packets were sent at packet number 102, 103 and 105. Finally, the audio stream from <2.113> was up-sped to G.711µ-law.

•---------- FAX Summary 2 ----------

PATH: 2.213:10000 => 2.116:10002

[

25]Codec

G723

 

[

105]NSE PT 100, EVT 192: Up-Speed,

CED tone Detected

[

107]Codec

G711u/D

 

PATH: 2.116:10002 => 2.213:10000

 

[

26]Codec

G723

 

[

101]Codec

G711u/D

 

[

102]NSE PT 100, EVT 192: Up-Speed,

CED tone Detected

[

103]NSE PT 100, EVT 193: ECAN OFF,

Phase Reversal Detected

This summarizes the fax events for each path.

The audio stream events reported by rtpcatch include:

–beginning of new audio codec

–silence packets

–lost packets

–erased packets (as in G.729)

The NSE events reported by rtpcatch include:

–event 32, Fax Mode, CED tone Detected (RFC2833)

–event 34, Modem Mode, ANSam tone Detected (RFC2833)

–event 192, Up-Speed, CED tone Detected

–event 193, ECAN OFF, Phase Reversal Detected

–event 194, ECAN ON, Silence Detected

–event 200, T38 Fax Mode, V.21 Detected

–event 201, T38 Fax Mode ACK

–event 202, T38 Fax Mode NACK

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

 

OL-4008-01

7-15

 

 

 

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Cisco Systems ATA 188 manual CED tone Detected
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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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