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Fax / Modem over IP

Cisco AVVID Gateway Support for Fax Relay and Fax Pass-Through

Document ID: 26982

Updated: Jan 08, 2007

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Introduction

This document provides a reference matrix for fax support in various Voice over IP (VoIP) gateways.

Prerequisites

Requirements

There are no specific requirements for this document.

Components Used

See the Fax Support Matrix section for more information on hardware and software versions.

The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, make sure that you understand the potential impact of any command.

Conventions

Refer to Cisco Technical Tips Conventions for more information on document conventions.

Fax Support Matrix

Platform Protocol Transport Mode Currently Supported Minimum Software Version
Analog Telephone Adaptor (ATA) 186 H.323 Pass-Through Yes 2.0
Relay No N/A
T.38 No N/A
Skinny Client Control Protocol (SCCP) Pass-Through Yes 2.14
Relay No N/A
T.38 No N/A
Media Gateway Control Protocol (MGCP) Pass-Through Yes 2.14 †
Relay No N/A
T.38 No N/A
Cisco 827-4V H.323 Pass-Through Yes Cisco IOS® Software Release 12.2(8)YN
Relay Yes Cisco IOS Software Release 12.2(8)YN
T.38 Yes Cisco IOS Software Release 12.2(8)YN †
Cisco VG200 H.323 Pass-Through Yes Cisco IOS Software Release 12.2.(13)T
Relay Yes Cisco IOS Software Release 12.1.(5)XM
T.38 No N/A
MGCP Pass-Through Yes Cisco IOS Software Release 12.2(11)T
Relay Yes Cisco IOS Software Release 12.2(11)T
T.38 No N/A
Cisco VG224 H.323 MGCP Pass-Through Fax-relay Yes Yes 12.3(8)T 12.3(8)T
Cisco VG248 SCCP Pass-Through Yes 1.2(1)
Relay Yes 1.0(1)
T.38 Yes 1.3(1)
Cisco 175x and 1760 H.323 Pass-Through Yes Cisco IOS Software Release 12.2(11)T
Relay Yes Cisco IOS Software Release 12.0(5)T
T.38 No Cisco IOS Software Release 12.2(11)T †
MGCP Pass-Through Yes Cisco IOS Software Release 12.3(1)
Relay Yes Cisco IOS Software Release 12.3(1)
T.38 Yes Cisco IOS Software Release 12.2(15)T
Cisco 26xx H.323 Pass-Through Yes Cisco IOS Software Release 12.2(11)T
Relay Yes Cisco IOS Software Release 12.0(5)T
T.38 Yes Cisco IOS Software Release 12.1(3)T †
MGCP Pass-Through Yes Cisco IOS Software Release 12.2(11)T
Relay Yes Cisco IOS Software Release 12.2(11)T
T.38 Yes Cisco IOS Software Release 12.2(11)T * †
Cisco 36xx H.323 Pass-Through Yes Cisco IOS Software Release 12.2(11)T
Relay Yes Cisco IOS Software Release 12.0(5)T
T.38 Yes Cisco IOS Software Release 12.1(3)T †
MGCP Pass-Through Yes Cisco IOS Software Release 12.2(11)T
Relay Yes Cisco IOS Software Release 12.2(11)T
T.38 Yes Cisco IOS Software Release 12.2(11)T * †
Cisco 37xx H.323 Pass-Through Yes Cisco IOS Software Release 12.2(11)T
Relay Yes Cisco IOS Software Release 12.2(8)T
T.38 Yes Cisco IOS Software Release 12.2(8)T †
MGCP Pass-Through Yes Cisco IOS Software Release 12.2(11)T
Relay Yes Cisco IOS Software Release 12.2(11)T
T.38 Yes Cisco IOS Software Release 12.2(11)T * †
Cisco 7200 H.323 Pass-Through Yes Cisco IOS Software Release 12.1(11)T
Relay Yes Cisco IOS Software Release 12.1(3)T
T.38 Yes Cisco IOS Software Release 12.2(4)T †
MGCP Pass-Through No N/A
Relay No N/A
T.38 No N/A
Cisco WS-X4604-GWY H.323 Pass-Through Yes Cisco IOS Software Release 12.2(11)T
Relay Yes Cisco IOS Software Release 12.2(11)T
T.38 No N/A
MGCP Pass-Through No N/A
Relay No N/A
T.38 No N/A
Cisco WS-X6608-E1/T1 MGCP Pass-Through Yes 3.1(1)
Relay Yes 3.1(1)
T.38 No N/A
Cisco WS-X6624-FXS MGCP Pass-Through Yes 3.1(1)
Relay Yes 3.1(1)
T.38 No N/A
Catalyst 4224 H.323 Pass-Through Yes Cisco IOS Software Release 12.2(2)YC4
Relay Yes Cisco IOS Software Release 12.2(2)YC4
T.38 No N/A
MGCP Pass-Through Yes Cisco IOS Software Release 12.2(2)YC4
Relay Yes Cisco IOS Software Release 12.2(2)YC4
T.38 No N/A
Cisco AS5300 H.323 Pass-Through Yes Cisco IOS Software Release 12.1.(3)T
Relay Yes Cisco IOS Software Release 12.1.(5)T
T.38 Yes Cisco IOS Software Release 12.1.3(T) †
MGCP (Not with Cisco CallManager) Pass-Through Yes Cisco IOS Software Release 12.2(8)T
Relay No N/A
T.38 Yes Cisco IOS Software Release 12.2(11)T3 †
Cisco DT-24+ MGCP Pass-Through Yes CCM 3.0(10)
Relay No N/A
T.38 No N/A
Cisco DE-30+ MGCP Pass-Through Yes 3.1(1)
Relay No N/A
T.38 No N/A
Cisco ICS 7750 H.323 Pass-Through Yes Cisco IOS Software Release 12.2(13)T
Relay Yes Cisco IOS Software Release 12.2(11)T
T.38 Yes Cisco IOS Software Release 12.2(11)T †
MGCP Pass-Through Yes Cisco IOS Software Releases 12.2(4)YH and 12.2(15)T
Relay Yes Cisco IOS Software Releases 12.2(4)YH and 12.2(15)T
T.38 Yes Cisco IOS Software Release 12.2(11)T †

Integrated Services Router Fax Support Matrix:

Platform Minimum Software Version
Cisco 2821 and Cisco 2851 Cisco IOS Software Release 12.3(8)T4
Cisco 3825 and 3845 Cisco IOS Software Release 12.3(11)T

Note: The Cisco 3825 can support one EVM-HD in either NME slot and the Cisco 3845 can support up to two EVM-HD in any two NME slots.

Matrix Table Notes

These notes apply to the matrix in this document:

  • (*) Cisco 26xx, 36xx, 37xx, and AS5300 support gateway-controlled T.38 with MGCP from Cisco IOS Software Release 12.2(11)T. However, it is not supported in the Cisco CallManager network until Cisco IOS Software Release 12.2(11)T3 where "forced" T.38 mode has been added.

  • (†) N/A with Cisco CallManager.

  • When using Fax/Modem pass-through between Catalyst 6000/VG248 and Cisco IOS gateways, you need:

    • Voice Gateway Routers: Cisco IOS Software Release 12.2.11T or later is recommended

    • VG248: 1.2.1

  • For Catalyst 6624, the loads A002030139S1 and A00203010041 are recommended.

  • For Catalyst 6608, the loads D004030145S1 and D00403010047 are recommended.

  • 3.2.(2c)SpD include loads D004030145S1 and A002030139S1.

  • 3.1(4)SpA and 3.2(2c)SpF include D00403010047 and A00203010041.

  • You must have Cisco CallManager version 3.1.3a or later to use fax pass-through mode on the Cisco ICS 7750.

T.38 Fax Relay Support with Cisco CallManager

The T.38 fax support with Cisco CallManager is as follows:

  • With Cisco CallManager 4.2.3, the T.38 fax relay is supported as given here:

    • Cisco Unified CallManager supports CA-controlled MGCP T.38 fax relay.

    • Fax calls use T.38 in CA-controlled mode if IOS enables T.38 (default)

    • Fax calls use fax pass-through (or Cisco fax relay) if IOS disables T.38 (transparent to Cisco Unified CallManager)

    • Both H.323 and MGCP (IOS only) support T.38 fax relay. For T.38 fax relay interworking between H.323 gateways and MGCP gateways, ensure MGCP gateways are configured to operate in CA-controlled mode.

  • With Cisco CallManager 5.0 and 5.1, the system supports both fax relay and fax pass-through. SIP Trunk supports calls that start as a voice call, then switch to T.38. In CallManager release 5.0, T.38 fax relay introduced this support:

    • SIP support through the SIP Trunk (configured by using SIP Trunk Configuration)

    • H.323 and SIP T.38 interoperability

    Note: Cisco Unified Communications Manager Release 5.0 does not include features from release 4.2(3). Release 6.0 includes those features.

  • With Cisco CallManager 6.0, the same features are supported as in Cisco CallManager 4.2.3. In CallManager Release 6.0, T.38 fax relay added this support:

    • T.38 interoperability support between SIP and MGCP

T.38 Enhancement Cisco Unified Communications Manager Release 4.1(1) Cisco Unified Communications Manager Release 4.2(3) Cisco Unified Communications Manager Release 5.0(1) Cisco Unified Communications Manager Release 6.0(1)
T.38 supports H.323 Yes Yes Yes Yes
T.38 supports MGCP and H.323 No Yes No Yes
T.38 supports H.323 and SIP No No Yes Yes
T.38 supports H.323, SIP, and MGCP No No No Yes

Related Information

Updated: Jan 08, 2007
Document ID: 26982