Media Gateway Control Protocol Fax Package
RFC 5347
| Document | Type |
RFC - Informational
(October 2008; Errata)
Was draft-andreasen-mgcp-fax (individual in rai area)
|
|
|---|---|---|---|
| Last updated | 2015-10-14 | ||
| Stream | IETF | ||
| Formats | plain text pdf html bibtex | ||
| Stream | WG state | (None) | |
| Document shepherd | No shepherd assigned | ||
| IESG | IESG state | RFC 5347 (Informational) | |
| Consensus Boilerplate | Unknown | ||
| Telechat date | |||
| Responsible AD | Cullen Jennings | ||
| Send notices to | joestone@cisco.com | ||
Network Working Group F. Andreasen
Request for Comments: 5347 Cisco Systems
Category: Informational D. Hancock
CableLabs
October 2008
Media Gateway Control Protocol Fax Package
Status of This Memo
This memo provides information for the Internet community. It does
not specify an Internet standard of any kind. Distribution of this
memo is unlimited.
Abstract
This document defines a Media Gateway Control Protocol (MGCP) package
to support fax calls. The package allows for fax calls to be
supported in two different ways. The first one utilizes ITU-T
Recommendation T.38 for fax relay under the control of the Call
Agent. The second one lets the gateway decide upon a method for fax
transmission as well as handle the details of the fax call without
Call Agent involvement.
Andreasen & Hancock Informational [Page 1]
RFC 5347 MGCP Fax Package October 2008
Table of Contents
1. Introduction ....................................................2
1.1. Conventions Used in This Document ..........................3
2. Fax Package Definition ..........................................3
2.1. LocalConnectionOptions .....................................3
2.1.1. T.38 Procedure (Strict or Loose) ....................6
2.1.2. Gateway Procedure ...................................8
2.1.3. Off Procedure .......................................8
2.1.4. Mode Operation ......................................8
2.1.5. Detecting a Fax Call ...............................10
2.1.6. Considerations for Determining Which
Procedures to Request ..............................11
2.2. Events and Signals ........................................13
2.2.1. Gateway Controlled Fax (gwfax) .....................13
2.2.2. No Special Fax Handling (nopfax) ...................14
2.2.3. T.38 Fax Relay (t38) ...............................14
2.3. Connection Parameters .....................................15
2.4. Negotiation of T.38 Parameters ............................16
2.5. Implementation Considerations .............................18
2.5.1. Media IP Address and Port for T.38 .................18
2.5.2. Case Sensitivity ...................................18
2.5.3. Boolean Indicator After T.38 Parameters ............19
3. Call Flow Examples .............................................19
3.1. Call Agent Controlled T.38 Strict .........................20
3.2. Multiple and Different Options ............................29
3.3. Interaction with SIP Endpoints ............................37
4. Security Considerations ........................................44
5. IANA Considerations ............................................44
6. Normative References ...........................................44
7. Informative References .........................................45
1. Introduction
This document defines a Media Gateway Control Protocol (MGCP)
[RFC3435] package that enables MGCP controlled gateways to support
fax calls. The package enables fax calls to be supported in two
different ways. The first one utilizes ITU-T Recommendation T.38
using either UDP Transport Layer (UDPTL) or TCP (see [T38]) for fax
relay under the control of the Call Agent. The second one lets the
gateway decide upon a method for fax transmission as well as handle
the details of the fax call without Call Agent involvement.
The fax package definition is provided in Section 2, and in Section 3
we provide three call flow examples showing how to use it. Security
considerations are found in Section 4, followed by the IANA
considerations and references.
Andreasen & Hancock Informational [Page 2]
RFC 5347 MGCP Fax Package October 2008
1.1. Conventions Used in This Document
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in BCP 14, RFC-2119
[RFC2119].
2. Fax Package Definition
A package is defined for fax. The package defines new
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