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Fax, Modem, and Text Support over IP Configuration Guide, Cisco IOS Release 15M&T Last Modified: 2015-07-31 Americas Headquarters Cisco Systems, Inc. 170 West Tasman Drive San Jose, CA 95134-1706 USA http://www.cisco.com Tel: 408 526-4000 800 553-NETS (6387) Fax: 408 527-0883 THE SPECIFICATIONS AND INFORMATION REGARDING THE PRODUCTS IN THIS MANUAL ARE SUBJECT TO CHANGE WITHOUT NOTICE. ALL STATEMENTS, INFORMATION, AND RECOMMENDATIONS IN THIS MANUAL ARE BELIEVED TO BE ACCURATE BUT ARE PRESENTED WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED. USERS MUST TAKE FULL RESPONSIBILITY FOR THEIR APPLICATION OF ANY PRODUCTS. THE SOFTWARE LICENSE AND LIMITED WARRANTY FOR THE ACCOMPANYING PRODUCT ARE SET FORTH IN THE INFORMATION PACKET THAT SHIPPED WITH THE PRODUCT AND ARE INCORPORATED HEREIN BY THIS REFERENCE. IF YOU ARE UNABLE TO LOCATE THE SOFTWARE LICENSE OR LIMITED WARRANTY, CONTACT YOUR CISCO REPRESENTATIVE FOR A COPY. The Cisco implementation of TCP header compression is an adaptation of a program developed by the University of California, Berkeley (UCB) as part of UCB's public domain version of the UNIX operating system. All rights reserved. Copyright © 1981, Regents of the University of California. NOTWITHSTANDING ANY OTHER WARRANTY HEREIN, ALL DOCUMENT FILES AND SOFTWARE OF THESE SUPPLIERS ARE PROVIDED “AS IS" WITH ALL FAULTS. CISCO AND THE ABOVE-NAMED SUPPLIERS DISCLAIM ALL WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION, THOSE OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OR ARISING FROM A COURSE OF DEALING, USAGE, OR TRADE PRACTICE. IN NO EVENT SHALL CISCO OR ITS SUPPLIERS BE LIABLE FOR ANY INDIRECT, SPECIAL, CONSEQUENTIAL, OR INCIDENTAL DAMAGES, INCLUDING, WITHOUT LIMITATION, LOST PROFITS OR LOSS OR DAMAGE TO DATA ARISING OUT OF THE USE OR INABILITY TO USE THIS MANUAL, EVEN IF CISCO OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. Any Internet Protocol (IP) addresses and phone numbers used in this document are not intended to be actual addresses and phone numbers. Any examples, command display output, network topology diagrams, and other figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses or phone numbers in illustrative content is unintentional and coincidental. All printed copies and duplicate soft copies of this document are considered uncontrolled. See the current online version for the latest version. Cisco has more than 200 offices worldwide. Addresses and phone numbers are listed on the Cisco website at www.cisco.com/go/offices. Cisco and the Cisco logo are trademarks or registered trademarks of Cisco and/or its affiliates in the U.S. and other countries. To view a list of Cisco trademarks, go to this URL: www.cisco.com go trademarks. Third-party trademarks mentioned are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. (1721R) © 2015 Cisco Systems, Inc. All rights reserved. CONTENTS CHAPTER 1 Fax and Modem Services over IP Overview 1 Fax and Modem Services over IP Overview 1 Finding Feature Information 1 Information About Cisco IOS Fax Services over IP 1 Fax Transmission in the PSTN 1 Fax Transmission over IP Networks 5 Cisco Fax Services 6 Information About Cisco IOS Modem Services over IP 18 Modem Passthrough over VoIP 18 Modem Relay over VoIP 21 Additional References 22 Related Documents 22 Standards 23 MIBs 24 RFCs 25 Technical Assistance 27 CHAPTER 2 Configuring Modem Passthrough 29 Configuring Modem Passthrough 29 Finding Feature Information 29 Prerequisites for Configuring Modem Passthrough 29 Restrictions for Configuring Modem Passthrough 30 Information About Modem Passthrough 30 Modem Passthrough Functions 30 Passthrough Rollover 31 Payload Redundancy 31 Fax, Modem, and Text Support over IP Configuration Guide, Cisco IOS Release 15M&T iii Contents Clock Slip Buffer Management 31 How to Configure Modem Passthrough 31 Configuring Modem Passthrough Globally 31 Configuring Modem Passthrough for a Specific Dial Peer 33 Troubleshooting Tips for Modem Passthrough 34 Configuration Examples for Modem Passthrough 35 Modem Passthrough Configuration for Cisco AS5300 Example 35 CHAPTER 3 Configuring Cisco Modem Relay 37 Configuring Cisco Modem Relay 37 Finding Feature Information 37 Prerequisites for Configuring Cisco Modem Relay 38 Restrictions for Configuring Cisco Modem Relay 38 Information about Cisco Modem Relay 39 Modes for Modem Transport 40 Modem Tone Detection and Signaling 40 Relay Switchover 40 Payload Redundancy 41 Dynamic and Static Jitter Buffers 41 Gateway-Controlled Modem Relay 41 How to Configure Modem Relay 41 Configuring Codec Complexity for TI 549 DSPs 41 Configuring MGCP Modem Relay 43 Configuring H.323 and SIP Modem Relay 46 Configuration Examples for Cisco Modem Relay 51 Cisco Modem Relay Enabled for MGCP Example 51 Dial Peer Configured by System Settings Example 54 CHAPTER 4 Configuring Fax Pass-Through 57 Configuring Fax Pass-Through 57 Finding Feature Information 57 Prerequisites for Configuring Fax Pass-Through 57 Restrictions for Configuring Fax Pass-Through 58 Information About Fax Pass-Through 59 Fax, Modem, and Text Support over IP Configuration Guide, Cisco IOS Release 15M&T iv Contents Pass-Through Method of Transport 59 Call Control for Fax Passthrough 59 How to Configure H.323 and SIP Fax Pass-Through 60 Configuring One or More Individual VoIP Dial Peers 61 Configuring VoIP Dial Peers Globally 62 How to Configure MGCP Fax Pass-Through 64 Configuration Examples for Fax Pass-Through 66 H.323 Fax Pass-Through Example 66 SIP Fax Pass-Through Example 68 MGCP Fax Pass-Through Example 69 CHAPTER 5 Configuring Cisco Fax Relay 71 Configuring Cisco Fax Relay 71 Finding Feature Information 71 Prerequisites for Configuring Cisco Fax Relay 71 Restrictions for Configuring Cisco Fax Relay 72 Information About Cisco Fax Relay 72 Methods for Fax Relay 72 Fax Relay Packet Loss Concealment 73 Fax CM Message Tone Suppression 73 How to Configure Cisco Fax Relay 74 Configuring Cisco Fax Relay for One or More Individual VoIP Dial Peers 74 Configuring Cisco Fax Relay for VoIP Dial Peers Globally 76 Configuration Examples for Cisco Fax Relay 77 MGCP VoIP Dial Peer Example 77 Configuration Disabled for MGCP Example 78 Show Fax Portion of Telephony Call Leg Example 79 CHAPTER 6 Configuring T.38 Fax Relay 81 Configuring T.38 Fax Relay 81 Finding Feature Information 83 Prerequisites for Configuring T.38 Fax Relay 83 H.323 and SIP T.38 Fax Relay 83 MGCP T.38 Fax Relay 83 Fax, Modem, and Text Support over IP Configuration Guide, Cisco IOS Release 15M&T v Contents SG3 Fax Support on Cisco TDM-IP Voice Gateways and Cisco UBE platforms 83 Restrictions for Configuring T.38 Fax Relay 84 H.323 T.38 Fax Relay 84 SIP T.38 Fax Relay 84 SG3 Fax Support on Cisco TDM-IP Voice Gateways and Cisco UBE Platforms 84 MGCP T.38 Fax Relay 85 Information About T.38 Fax Relay 85 Methods for Fax Relay 85 T.38 Fax Relay Functions 85 T.38 Fax Relay Call Control 85 SG3 Fax Support on Cisco TDM-IP Voice Gateways and Cisco UBE Platforms 87 Fax CM Message Tone Suppression 91 How to Configure H.323 and SIP T.38 Fax Relay 91 Configuring One or More Individual VoIP Dial Peers for T.38 Fax Relay 92 Configuring T.38 Fax Relay on VoIP Dial Peers Globally 95 How to Configure MGCP T.38 Fax Relay 98 Configuring Gateway-Controlled MGCP T.38 Fax Relay 98 Configuring CA-Controlled MGCP T.38 Fax Relay 101 Troubleshooting Tips for MGCP T.38 Fax Relay 102 Configuration Examples for T.38 Fax Relay 102 H.323 T.38 Fax Relay with ECM Enabled Example 102 T.38 Fax Relay with ECM Disabled on Dial Peer Example 103 Gateway-Controlled MGCP T.38 Fax Relay Example 103 CA-Controlled MGCP T.38 Fax Relay Example 104 SG3 Fax Support on the Cisco TDM-IP Voice Gateways and Cisco UBE Platforms Example 105 CHAPTER 7 T.38 Fax Support on Cisco UBE for IPv6 107 T.38 Fax Support on Cisco UBE for IPv6 107 Finding Feature Information 107 Information About T.38 Fax Support on Cisco UBE for IPv6 107 Cisco Unified Border Element in VoIPv6 107 How to Configure T.38 Fax Support on Cisco UBE for IPv6 107 Configuring IPv6 Support for Cisco UBE 107 Configuring T.38 Fax Globally 109 Fax, Modem, and Text Support over IP Configuration Guide, Cisco IOS Release 15M&T vi Contents Configuration Examples for T.38 Fax Support on Cisco UBE for IPv6 110 Example: Verifying T.38 Fax Configuration 110 Additional References 112 Feature Information for T.38 Fax Support on Cisco UBE for IPv6 113 CHAPTER 8 Configuring T.37 Store-and-Forward Fax 115 Configuring T.37 Store-and-Forward Fax 115 Finding Feature Information 115 Prerequisites for Configuring T.37 Store-and-Forward Fax 115 Restrictions for Configuring T.37 Store-and-Forward Fax 115 Information About T.37 Store-and-Forward Fax 116 On-Ramp and Off-Ramp Fax Machines 117 Dial Peer Parameters for T.37 Store-and-Forward Fax 118 How to Configure T.37 Store-and-Forward Fax 119 Downloading the T.37 Store-and-Forward Fax Scripts 119 Configuring an On-Ramp Gateway for T.37 Store-and-Forward Fax 120 Enabling T.37 Store-and-Forward Fax on the On-Ramp Gateway 120 Configuring Dial Peers on the On-Ramp Gateway 122 Configuring MTA Parameters on the On-Ramp Gateway 129 Configuring DSNs on the On-Ramp Gateway 132 Configuring Security and Accounting on the On-Ramp Gateway 133 Configuring T.37 IVR Application Security and Accounting 136 How to Configure an Off-Ramp Gateway for T.37 Store-and-Forward Fax 139 Enabling T.37 Store-and-Forward Fax on the Off-Ramp
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