Media Gateway Control Protocol Fax Package

Media Gateway Control Protocol (MGCP) Voiceband Data (VBD) Package and General-Purpose Media Descriptor Parameter Package

“…For example, the gwvbd procedure may be initiated upon detecting called terminal identification (CED). Subsequently, the Call Agent controlled T.38 procedure of the MGCP Fax (FXR) package [RFC5347] may be initiated upon detecting V.21 flags. Upon receipt of a "t38(start)" event, the Call Agent will instruct the gateway to switch from VBD to T.38 through the use of a ModifyConnection command involving a LocalConnectionOption encoding method of "L:a:image/t38" and/or a RemoteConnectionDescriptor with an "image/t38" media description.…”

“…These steps correspond to the Call Agent controlled T.38 strict procedure as defined in the MGCP Fax (FXR) package [RFC5347].…”

“…The VBD package is intended to complement the MGCP Fax (FXR) package [RFC5347]. This document will explore the use of the FXR package with VBD.…”