Chapter 7 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 7-9 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 7-10 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 (H.323)

 

OL-4008-01

7-19

 

 

 

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Image 149
Cisco Systems ATA 188 manual Example 7-9 Fax Pass-through Mode Failure
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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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