Media Gateway Control Protocol Fax Package
RFC 5347
Document | Type |
RFC - Informational
(October 2008; Errata)
Was draft-andreasen-mgcp-fax (individual in rai area)
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Authors | Flemming Andreasen , David Hancock | ||
Last updated | 2015-10-14 | ||
Stream | IETF | ||
Formats | plain text html pdf htmlized 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 LocalConnectionOptions, events, and connection parameters as detailed below: Package Name: FXR Package Version: 0 2.1. LocalConnectionOptions A new Fax LocalConnectionOptions (LCO) parameter is defined for fax handling. The Call Agent supplies this fax LCO to indicate the desired fax handling procedure to the Media Gateway. The fax LCOShow full document text