Cisco BTS 10200 Softswitch User Manual
T.38 fax relay
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Cisco BTS 10200 Softswitch T.38 Fax Relay
Feature History
Release
900.03.02.00
This Feature Module describes the support provided by the Cisco BTS 10200 Softswitch software in
Release 3.2 and 3.3 for ITU-T recommendation T.38 Fax Relay, T.38 Fax Relay is used for transporting
real-time Group 3 Fax documents over the Internet Protocol (IP), commonly used in packet networks.
This feature module includes the following sections:
Introduction, page 2
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T.38 Benefits, page 4
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External Interfaces, page 7
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Related Features, page 11
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Supported Platforms, page 11
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Supported Standards, page 12
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Prerequisites, page 13
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Configuration Tasks, page 13
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Command Reference, page 13
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Troubleshooting Fax Relay, page 17
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Glossary, page 24
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Copyright Notice, page 27
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Modification
This feature was initially introduced on the Cisco BTS 10200 Softswitch
in Release 3.2.
Fax Basics, page 2
Fax Relay Basics, page 3
Fax Modes, page 4
Billing Interface, page 7
Alarms/Events, page 7
Measurements, page 7
Provisioning, page 8
Cisco IOS Release xx.x(x)X
1
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Table of Contents
Related Manuals for Cisco BTS 10200 Softswitch
Summary of Contents for Cisco BTS 10200 Softswitch
- Page 1 This feature was initially introduced on the Cisco BTS 10200 Softswitch in Release 3.2. This Feature Module describes the support provided by the Cisco BTS 10200 Softswitch software in Release 3.2 and 3.3 for ITU-T recommendation T.38 Fax Relay, T.38 Fax Relay is used for transporting real-time Group 3 Fax documents over the Internet Protocol (IP), commonly used in packet networks.
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Page 2: Introduction
Modified Huffman (MH) encoding or Modified Read (MR) encoding. MH encoding usually compresses fax transmission at a 20:1 ratio. MR encoding typically provides a 20 percent compression improvement over MH, but is slightly less resistant to error. Cisco BTS 10200 Softswitch T.38 Fax Relay Support... -
Page 3: Fax Relay Basics
Support of ITU-T.38 Fax Relay in the Cisco BTS 10200 Softswitch is a move toward true voice-data convergence where the end user can use the same lines for voice and data (fax) in heterogeneous (multi-protocol) networks. -
Page 4: Fax Modes
T.38-enabled gateways and gatekeepers in mixed vendor networks where real time fax relay capabilities are required. H.323 is just one of several native signaling protocols supported by the Cisco BTS 10200 Softswitch. The H.323 interface allows the Cisco BTS 10200 Softswitch to function as a switching platform for heterogeneous networks. -
Page 5: Capability Negotiation
During the initial bearer path setup, the Cisco BTS 10200 Softswitch negotiates the T.38 Fax Relay capabilities of both the originating and terminatinggateways (endpoints). - Page 6 In the absence of dynamic capability exchange, capabilities are provided by current H.323 networks during the call setup time. Due to protocol complexities, the Cisco BTS 10200 Softswitch currently has static provisioning per logical H.323 network cloud. They are provisioned in the H.323-TG-PROFILE table that can be associated with certain H.323-GW (or H.323-endpoint) entries.
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Page 7: External Interfaces
Table 2 lists the T.38 specific traffic counter values reported by the Cisco BTS 10200 Softswitch. For detailed information about Cisco BTS 10200 Softswitch measurements refer to the Cisco BTS 10200 Softswitch Operations Guide. Cisco BTS 10200 Softswitch T.38 Fax Relay Support... -
Page 8: Provisioning
Provisioning This section describes provisioning changes that resulted from the addition of the T.38 Fax Relay feature to the Cisco BTS 10200 Softswitch software. For more information on provisioning commands, refer to “Command Reference” section on page H323_GW—This table defines the capabilities of each H.323 protocol gateway. The parameters added for T.38 fax relay include:... - Page 9 Cisco BTS 10200 Softswitch T.38 Fax Relay External Interfaces Call Flow The following call flow diagram (Figure 1) illustrates the interactions between the Cisco BTS 10200 Softswitch software modules for the CA-controlled T.38 Fax Relay implementation. Figure 1 CA-Controlled T.38 Fax Relay CNM API...
- Page 10 SAI_EI_FAX_STOP event. It then relays the fax information to the other Signaling Adapter in the SAI_CCM_SVCFEATURE_REQ. Following this, the call is cleared in a normal manner upon the receipt of SAI_REL_IND from the H3A. Cisco BTS 10200 Softswitch T.38 Fax Relay Support...
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Page 11: Related Features
Related Features The T.38 Fax Relay feature is directly related to the H.323 features introduced in Release 3.1 and 3.2. For more information on the H.323 features, refer to the Cisco BTS 10200 Softswitch System Description . Note Related Documents This Release 3.2 T.38 Fax Relay Feature Module should be used in conjunction with the following... -
Page 12: Supported Standards
Cisco Feature Navigator is a web-based tool that enables you to determine which Cisco IOS software images support a specific set of features and which features are supported in a specific Cisco IOS image. You can search by feature or release. Under the release section, you can compare releases side by side to display both the features unique to each software release and the features in common. -
Page 13: Configuration Tasks
This section documents new or modified Cisco BTS 10200 Softswitch commands associated with the T.38 Fax Relay feature. All other commands used with this feature are documented in the Cisco BTS 10200 Softswitch Release 3.2/3.3 Command Reference Guide or in the Cisco user documentation for the gateway(s) you are using. - Page 14 Token Values FAX-RELAY-CAP INBAND—Possible only for G.711 and G.726, supported by MGX 8260. Specifies FAX Relay T38-CA-FAX—CA-controlled issuing RequestMode relay in real time. Option for this gateway. This is the default value. Cisco BTS 10200 Softswitch T.38 Fax Relay Support...
- Page 15 T.38 mode). FAX-INBAND-SUPP Y/N (Default = N) FAX-PREF-MODE FAX-T38-CAMODE—This is the default value. Designates preferred mode of FAX-INBAND—Possible only for G.711 and G.726. supported by T.38 fax relay for this gateway. MGX 8260. Cisco BTS 10200 Softswitch T.38 Fax Relay Support...
- Page 16 Specifies whether inband mode of fax relay is supported. FAX-PREF-MODE FAX-T38-CAMODE—This is the default value. Designates preferred mode of FAX-INBAND—Possible only for G.711 and G.726, T.38 fax relay for this gateway. supported by MGX 8260. Cisco BTS 10200 Softswitch T.38 Fax Relay Support...
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Page 17: Troubleshooting Fax Relay
The purpose of this section is to provide basic troubleshooting procedures for anyone trying to resolve Cisco BTS 10200 Softswitch T.38 fax relay issues. The technical intricacies of faxing and fax relay are not covered in detail, but you will get a basic understanding and be able to perform troubleshooting for a majority of common fax relay issues. - Page 18 There are several known problems associated with cRTP. Fixes are available for these problems and it makes sense to disable cRTP when fax relay problems occur and to check whether a Cisco IOS Software upgrade is an appropriate course of action.
- Page 19 Make sure you reload the Cisco media gateway; otherwise the fax interface-type t38 command won't take effect. Fax calls will fail on some Cisco media gateways with T.38 fax relay, so this is an important command to check. This problem is seen when a gateway is upgraded to Cisco IOS Release 12.2 or later.
- Page 20 • isolated to the T.38 fax relay software and you should open a case with the Cisco TAC. If this test fails, it is very likely that whatever is causing the fax calls to fail with T.38 fax relay is also causing the failures with this test.
- Page 21 In the previous step, searches were made for a specific fax brand in the hope of identifying a known issue between a certain fax brand and the Cisco T.38 fax relay code. The next step is to perform a generic search since there could be a fax relay defect in the Cisco IOS Software release installed.
- Page 22 If the fax codecs were not loaded correctly, there is probably a software problem. Make sure that the latest release is used and, if there is still a problem, open a case with the Cisco TAC. Cisco BTS 10200 Softswitch T.38 Fax Relay Support...
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Page 23: Opening A Tac Case
Opening a TAC Case If this document has not enabled you to isolate and resolve the problem, open a case with the Cisco Technical Assistance Center (TAC) and provide the following information: Network topology description (PDF, Visio, or Microsoft PowerPoint format). -
Page 24: Glossary
H.323 —ITU-T Recommendation for “Visual Telephony System” and equipment for local area networks which provide a non-guaranteed quality of service. H3A —H.323 Gateway Adapter HCM —High-density Compression Module. HNPA —Home Numbering Plan Area Cisco BTS 10200 Softswitch T.38 Fax Relay Support... - Page 25 Group 3 facsimile terminals over the Internet or other networks using IP protocols. The recommendation allows the use of either TCP or UDP depending on the service environment. TCS —Terminal Capability Set Cisco BTS 10200 Softswitch T.38 Fax Relay Support...
- Page 26 Cisco BTS 10200 Softswitch T.38 Fax Relay Glossary TDM —Time Division Multiplexing TDP —Trigger Detection Point TG —Trunk Group VCM —Voice Compression Module. Cisco BTS 10200 Softswitch T.38 Fax Relay Support...
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Page 27: Copyright Notice
DAMAGES. CCVP, the Cisco logo, and the Cisco Square Bridge logo are trademarks of Cisco Systems, Inc.; Changing the Way We Work, Live, Play, and Learn is a service mark of Cisco Systems, Inc.; and Access Registrar, Aironet, BPX, Catalyst, CCDA, CCDP, CCIE, CCIP, CCNA, CCNP, CCSP, Cisco, the Cisco Certified Internetwork Expert logo, Cisco IOS, Cisco Press,... - Page 28 Cisco BTS 10200 Softswitch T.38 Fax Relay Copyright Notice Cisco BTS 10200 Softswitch T.38 Fax Relay Support...