ITU-T V.150.1

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ITU-T RECOMMENDATION V.150.1 PROCEDURES FOR THE END-TO-END CONNECTION OF V-SERIES DCES OVER AN IP NETWORK 1 Scope This Recommendation specifies the operation between two IP Network gateways to facilitate the end-to-end connection of V-series DCEs over an IP network. The gateways are specified herein in terms of their functionality, signals and messages and operating procedures. The principal characteristics of these gateways are as follows: a) Support of a mechanism to allow the transparent transport of modem signals end-to-end. b) Support of mechanisms to allow the termination of modem signals at the gateways and the transport of the data between gateways. c) The definition of a transport protocol, which can be used to relay the data between gateways. d) The definition of procedures to allow gateways to transition between Voice-over- Internet Protocol and Modem-over-Internet Protocol operation. This Recommendation includes mandatory requirements, recommendations and options; these are designated by the words "shall," "should," and "may" respectively. 2 References The following Recommendations contain provisions, which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated were valid. All Recommendations are subject to revision; all users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent editions of the Recommendations listed below. A list of currently valid ITU-T Recommendations is regularly published. – ITU-T Recommendation G.711 - 1988 – Pulse Code Modulation (PCM) of voice frequencies – ITU-T Recommendation H.245 - 2002 – Control protocol for multimedia communication. – ITU-T Recommendation H.248 - 2000 – Gateway control protocol – ITU-T Recommendation H.323 Annex P - 2002 – Transfer of Modem Signals over H.323. – ITU-T Recommendation T.38 - 2002 – Procedures for real-time Group 3 facsimile communication over IP networks – ITU-T Recommendation V.8 - 1998 - Procedures for starting and ending sessions of data transmission over the public switched telephone network. – ITU-T Recommendation V.8 bis - 1996 - Procedures for the identification and selection of common modes of operation between data circuit-terminating equipments (DCEs) and ITU-T Rec. V.150.1 (01/2003) – Prepublished version 2
− − − − − between data terminal equipments (DTEs) over the general switched telephone network and on leased point-to-point telephone-type circuits. ITU-T Recommendation V.14 - 1993 - Transmission of start-stop characters over synchronous bearer channels ITU-T Recommendation V.17 - 1991 - A 2-wire modem for facsimile applications with rates up to 14 400 bit/s. ITU-T Recommendation V.18 - 2000 - Operational and interworking requirements for DCES operating in the text telephone mode. ITU-T Recommendation V.21 - 1988 - 300 bits per second duplex modem standardized for use in the general switched telephone network. ITU-T Recommendation V.22 bis - 1988 - 2 400 bits per second duplex modem using the frequency division technique standardized for use on the general switched telephone network and on point-to-point 2-wire leased telephone-type circuits. − ITU-T Recommendation V.23 - 1988 - 600/1 200-baud modem standardized for use in the general switched telephone network. – ITU-T (CCITT) Recommendation V.24 - 2000 - List of definitions for interchange circuits between data terminal equipment (DTE) and data circuit-terminating equipment (DCE). − − − − ITU-T Recommendation V.25 - 1996 - Automatic answering equipment and general procedures for automatic calling equipment on the general switched telephone network including procedures for disabling of echo control devices for both manually and automatically established calls. ITU-T Recommendation V.26 bis - 1984 - 2 800/1 200 bits per second modem standardized for use in the general switched telephone network ITU-T Recommendation V.26 ter - 1988 - 2 400 bits per second duplex modem using the echo cancellation technique standardized for use in the general switched telephone network and on point-to-point 2-wire leased telephone –type circuits. ITU-T Recommendation V.27 ter - 1984 - 4 800/2 400 bits per second modem standardized for use in the general switched telephone network − ITU-T Recommendation V.29 - 1988 - 9 600 bits per second modem standardized for use on point-to-point 4-wire leased telephone-type circuits. – ITU-T (CCITT) Recommendation V.32 bis - 1991 - A duplex modem operating at data signalling rates of up to 14 400 bit/s for use on the general switched telephone network and on leased point-to-point 2-wire telephone-type circuits. – ITU-T Recommendation V.34 - 1998 - A modem operating at data signalling rates of up to 33 600 bit/s for use on the general switched telephone network and on leased point-to-point 2-wire telephone-type circuits. − − − − ITU-T Recommendation V.42 - 2002 - Error correcting procedures for DCEs using asynchronous-to-synchronous conversion ITU-T Recommendation V.42 bis -1990 - Data compression procedures for data circuitterminating equipment (DCE) using error correction procedures ITU-T Recommendation V.44 - 2000 - Data Compression Procedures ITU-T Recommendation V.90 - 1998 - A digital modem and analogue modem pair for use on a public switched telephone network (PSTN) at data signalling rates of up to 56 000 bit/s downstream and up to 33 600 bit/s upstream. ITU-T Rec. V.150.1 (01/2003) – Prepublished version 3
Page 1 and 2: INTERNATIONAL TELECOMMUNICATION UNI
Page 3: Recommendation V.150.1 (V.MoIP) ___
Page 7 and 8: No-Trans-Compression Gateway: Is a
Page 9 and 10: MR1 Modem Relay Connection Scenario
Page 11 and 12: MoIP application data cmpr error co
Page 13 and 14: Modem Relay defines two Gateway typ
Page 15 and 16: For modulations that allow the sele
Page 17 and 18: M1 PSTN IP-Network PSTN RSC G1 G2 M
Page 19 and 20: 12.3.2.1 Rate Match Rule The follow
Page 21 and 22: a break type translation or mapping
Page 23 and 24: M1 G1 G2 M2 Cx Dx Cx Dx Cx Dx Dx Cx
Page 25 and 26: The method and means for the Gatewa
Page 27 and 28: 14.7 Gateway to Gateway control Cha
Page 29 and 30: Available 15.2.2.3 V.42 bis Paramet
Page 31 and 32: TABLE 8/V.150.1 Parameter JM Delay
Page 33 and 34: Tone (2225 Hz) 12 None V.21 Ch2 HDL
Page 35 and 36: TABLE 16/V.150.1 List of Modem Rela
Page 37 and 38: 8:15 XID/LR field Octet 1: These fi
Page 39 and 40: 10 1 denotes V.27 ter availability
Page 41 and 42: 8:11 Selected Compression: This fie
Page 43 and 44: 8:15 Break Length: This eight-bit f
Page 45 and 46: TABLE 28/V.150.1 CLRDOWN definition
Page 47 and 48: msgID Octets Figure 14/V.150.1 - Oc
Page 49 and 50: 15.4.11.4 Bit compressed data segme
Page 51 and 52: This data type does not allow a cha
Page 53 and 54: 20.3 Call Discrimination Procedure/
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ANS and /ANSam event means that the
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20.6.2 G1 may request a switch to M
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Macro Definition Procedure Call Mac
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SIL CDTO† UKN† ABR SPE has dete
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20.8.3 SDL Macro Definitions (x,y,z
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. . . . . . RFC 2833 - ANS or RFC 2
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20.8.6 SDL Diagrams for state (a,v)
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20.8.10SDL Diagrams for state (v,a)
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21 Procedures for Audio to MoIP tra
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TLP - Discard data not yet delivere
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GnV44TX = {GnV44TxDictionary, GnV44
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A M1 G1 XID M1 XID_XCHG(XID M1 ) G2
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C D C D D C D C C D C D D C D C C D
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This computation is simply an appli
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o o o o o o o Be packet preserving
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ANNEX B Simple Packet Relay Transpo
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IP UDP SPRT HEADER SPRT PAYLOAD Fig
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acknowledgment for any Transmit Cha
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The setting and control of timers T
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assigned to an RTP encoding. The Mo
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0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
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An implementation need not support
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When: • timer t1 decrements to 0;
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An exception to this is the case wh
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parameter separately for each possi
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The consists of one dynamically as
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In the context of VBD declaration,
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m=audio 49232 udpsprt 98 a=sprtmap:
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a=sprtparm:180 100 $ 240 40 25 a=sp
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following attributes must be provid
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a=rtpmap:97 telephone-event/8000 a=
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with a different set of modulation
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} { -- Including a SEQUENCE for a p
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TABLE F.3/V.150.1 Signals and Event
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I.5 Modem Relay Connection Scenario
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APPENDIX II Call Discrimination Cal
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A M1 G1 G2 M2 ANSam A A ANSam A CM
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A M1 G1 G2 M2 ANS A A timeout ANS A
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F1 G1 G2 F2 A A A A SSE:FR(V21Flags
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T1 G1 G2 T2 A A V SSE:TR(tdd type)
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detection of ANS and ANSam. Unless
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V.2.7 V.8 CM (and V.92 QCA1a or QCA
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VI.3.1 Modulation The transmission
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3. Depending on the mode (Raw or Ch
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VII.4.2 Predicting the XIDr/LRr M2
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an XIDr/LRr immediately on receivin
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ITU-T V.150.1

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