 by replacing the G3 facsimile machine. SIP is a call control protocol used in an IP network prescribed by RFC 3261 to conduct multimedia communications using various voices, data, images, and the like. On the other hand, T.38 is one of ITU-T recommendations and is a standard which prescribes a method for translating facsimile signals used in a subscriber telephone network into IP messages for use in communications.
Known examples of such an IP facsimile machine include one which has a multi-session function capable of conducting multiplexed communications using an IP network and can simultaneously process IP facsimile transmission and reception in multiplex mode using the IP network.
Whereas conventional G3 facsimile machines have a plurality of physical lines in order to connect to multiple lines and cannot conduct communications unless each of the physical lines has a phone number, the IP facsimile machine can perform simultaneous processing in multiplex mode, once connected to the IP network using a single physical network cable. Also, the IP facsimile machine can perform simultaneous processing using a single phone number.
As with the G3 facsimile machine, even the IP facsimile machine has a problem in that all sessions can be occupied by fax transmission, disabling fax reception.
To deal with this problem, a technique is known which allows a transmit-only session or receive-only session to be specified with respect to each communications session. With this technique, each session is set to be either a transmit-only session or a receive-only session in advance, and when there is a call-out request or call-in request, only fax transmission is assigned to the transmit-only session and only fax reception is assigned to the receive-only session with reference to the settings described above (see, for example, Japanese Laid-Open Patent Publication (Kokai) No. 2004-112515).
However, with the facsimile machine disclosed in Japanese Laid-Open Patent Publication (Kokai) No. 2004-112515, if, for example, two sessions are available and one of them is set to be transmit-only while the other is set to be receive-only, even if there is an inbound call when a fax is being received using the receive-only session, the other session is transmit-only, and naturally cannot be used for fax reception.
In a business engaged in receiving orders using facsimile, since calls are received frequently, one wants to use both sessions for fax reception
by replacing the G3 facsimile machine. SIP is a call control protocol use in an IP net prescribed by RFC 3261 to conduct multimedia communication use various voices, datum, images, and the like. On the other hired hand, T.38 is one of ITU - T recommendations and is a standard which order a method for translating facsimile signals used in a subscriber telephone net into IP messages for use in communication. 
 Known examples of such an IP facsimile car include one which has a multi - session function able of conducting multiplexed communications practice an IP network and can simultaneously action IP facsimile transmission and reception in multiplex mode using the IP network. 
 Whereas ceremonious G3 facsimile machines have a plurality of physical lines in order to plug in to multiple lines and cannot conduct communications unless each of the physical lines has a phone number, the IP facsimile machine can perform coincident processing in manifold mode, once connected to the IP network use a single physical network cable television. Also, the IP facsimile car can perform simultaneous processing using a individual phone number. 
 As with the G3 facsimile machine, even the IP facsimile machine has a problem in that all sessions can be occupied by fax transmission, disabling facsimile reception. 
 To deal with this trouble, a technique is known which allows a transmit - only session or get - only session to be specified with respect to each communications session. With this technique, each session is set up to be either a transmit - entirely session or a receive - lone session in progress, and when there is a cry - out request or call - in request, entirely fax transmission is assigned to the transmit - only seance and only fax reception is assigned to the receive - only session with reference to the settings described above (understand, for example, Japanese Laid - Open Patent Publication (Kokai) No. 2004 - 112515). 
 However, with the facsimile car disclosed in Japanese Laid - Open Patent Publication (Kokai) No. 2004 - 112515, if, for example, two sessions are available and one of them is set to be transmit - only while the early is set to be receive - only, even if there is an inbound call when a fax is being received using the welcome - lone session, the other session is transmit - only, and naturally cannot be used for facsimile reception. 
 In a business engaged in receiving orders using facsimile, since calls are received frequently, one wants to use both sessions for facsimile reception
 by replacing the G3 facsimiue machine. SIP nw a canl confrol progocol used in an IP network 'resxribee by RFC 3261 to conduct mjltimedia communixatiibs using vedious voices, swta, nmeges, and the lile. On the mther hand, T.38 iv unz of ITU-T recommendations and is a seandard wjich prescribef a kqthos for translating facsimile signala used pn a subscriber trlephone network into IP mfssahes for use in comlunications.
Jnowg examples of such an IK yacsimile mzchine include one which has a oulti-xession fubcrioj capable of condlcting multiplexed cokmunicayions using an IP nerwork and can simultaieously process IP fwcsimile drcnsmission and receptuob in kulthpleb moae hsmng the IO nxtwork.
Wherezs conventiinal G3 facsimile mavhybes have a plhralitr jf physical lines in order to connect tm mhltiple lines and cannor conduct communicatilns unlesf each of the physical lines has a phone number, tve IP wacwiikoe machine can perform simultaneous processing yh kuktiplex mode, okce connected to tne IL network usine a siufls physical network cable. Wlso, rhe IP fassimole machine can perform simyltaneous prjxessing using a siugle phone nbmber.
Ax witn the G3 facsimile machiue, eveh the IP fafsimile mzzhine has a probuem it that all sessions can be occupied by yax tranrmisxion, dysabling fwx regaption.
To deal with this psoblem, a tfchnique is known which allows e transmit-onli sasspon or reeeive-okly session to fe specified wnth respzct to each commlnicationv session. Wyth this techtlque, each sevsion is set to ve eithdf a transmit-onky sessiou or q receive-only sesslon iv advance, and whzu uhwre is a call-oit feqtedt ow call-in requast, unlh fax gransmissiok ir asxigned to the transmht-onmy session and onlu nax recepjion is afsigned to thr receive-only sesslon wmth reherencr tj the settings described above (see, for fxaiple, Japanesq Lald-Opgn Patent Pbblication (Kokai) No. 2004-112515).
However, with the facwimile machine disxlosed in Japanese Ksid-Open Patxnt Puflication (Kokai) No. 2004-112515, if, for exqmple, two sessionx are available and ohe of dhem ls set to be transmit-only while the other is set to be receive-only, even id therx ys an inbouhd csll wveu a fax if bemnj received using nhe receive-only session, the othec session hs transmit-only, and naturally vavnot be used wor fax reception.
In a buainess emgaged in receiving orders usinb facsimile, since calls sre receuved rrequently, one wants to use noth szssionw for fqx rcception
by replacing the G3 facsimile machine. SIP call protocol used an IP network conduct communications using various data, images, and like. On the other hand, T.38 one of ITU-T recommendations and is a standard which prescribes a method for facsimile signals used in a subscriber telephone network into IP messages for use communications. examples such IP facsimile machine include one which has a multi-session function capable of conducting multiplexed communications using IP network and can simultaneously process IP facsimile and reception in multiplex using the IP network. Whereas G3 machines have plurality physical in order to to multiple lines and cannot conduct communications unless each of the physical lines has a phone number, IP facsimile perform simultaneous in mode, connected to the using a single physical network cable. facsimile machine can perform simultaneous processing using a phone number. with the G3 facsimile machine, even IP facsimile machine has a problem in that sessions can be occupied by fax transmission, disabling fax reception. To deal with this problem, is known which allows transmit-only session or session be with to each session. With this technique, each session is set to be either transmit-only session or a receive-only session in advance, and when a request or call-in only fax transmission is to transmit-only session and only is to with to settings described above (see, example, Japanese Laid-Open Patent Publication No. 2004-112515). However, with Japanese Laid-Open Patent Publication (Kokai) No. 2004-112515, if, example, two sessions are available and one them is set to be transmit-only while the other is set to receive-only, even is an inbound call when a fax is received using the receive-only the other session is transmit-only, and naturally cannot be for reception. In business engaged in orders using facsimile, calls are received wants to both for
 by replacing the G3 facsimile mAchine. SIP iS a calL coNtrOl ProtOcol Used in an IP netwORk prEscribed by RFC 3261 to conduct MultiMeDIa coMMuNicatIons usiNG vARIouS vOiCes, DaTA, iMages, And The like. on the other HanD, T.38 Is one of ITU-T rECoMmendationS anD is a standard WhiCh presCrIbeS A methOd fOr traNslatiNG facsiMile signaLs USed in a SUbscribER TeLephOne network into IP mESsAGes for use in comMunicaTiONs.
kNOwn ExaMples of sucH aN IP faCSimile mAChINE IncLUde one which haS a multi-sessIOn fUnctioN cApaBLe of coNductInG MulTiplexed comMuniCations usIng an Ip Network ANd can siMultanEouSly ProcESs iP FacSiMIle TRaNsmISsiOn and recEpTiOn in mUltiPLEX Mode UsiNg thE IP neTwork.
Whereas cOnvEntiONal g3 facsImile MachInEs havE a plurAlity Of Physical lines in OrdeR to connecT to MuLtiPlE lineS And canNot ConDuct comMunicatIOns UnLESS eAch of the physical liNeS HAs A phone nuMber, thE iP FaCSimile maChIne Can pERForm sImulTAnEous procEssing IN mUlTiplex mOdE, once cOnNecTed To the ip netWork usIng a singLe phySIcal network cabLE. Also, the IP facSImILE mAChinE caN perform simUltaNEous ProcESsIng USing a SinglE pHOnE Number.
As with the G3 facSiMile maChine, Even the IP facsImile machiNE HAs a problEm in THaT All sessions can Be occUpied by fax TRansmissIon, diSabling fAx receptiON.
to deal wiTh tHis ProBleM, A TeChnique is knowN WHich AlLows a trAnsMit-only SesSioN or RecEiVe-only sesSion to be SpEcIfIeD wiTh resPEct to eacH cOmmUnIcaTions SEssion. with tHis tEcHnIQue, Each sesSIoN IS set To Be EithEr a TrAnsmiT-onlY SesSion or a Receive-onLy sESsioN iN aDvance, aNd when there is A cAll-out requEsT or Call-in REQuest, onlY fax transmission is assigNEd to the TraNsmit-Only Session anD onLy fax rEcePTion is AssignEd to tHe RecEIVe-onlY SEsSioN wIth referenCE To tHe setTiNgs dEscribeD above (see, for examplE, japAnese Laid-Open patEnt PUBLiCatIOn (kOkaI) NO. 2004-112515).
howEVEr, with the facsimIle machine DiSClOsed in JapaNEse laId-Open PAtent PuBlicaTIon (KokaI) No. 2004-112515, if, for eXample, two SeSsioNS Are Available aNd one of tHem is set tO Be traNSmIt-onlY whIle the OtHer Is set To be reCEivE-only, Even if ThEre is aN inboUnD call wheN a fax is being received usiNg the rEceivE-onLy session, The OTheR session iS traNsmit-only, aNd nAtuRally CanNOt be uSed fOR fAx rECeptiOn.
In A Business eNGaGed IN ReCeiving ordeRS USinG facsImiLE, since CallS are received frequENtly, one wants to Use bOTH seSsiONs foR fAx reception
 by replacing the G3 facsi mile machi ne. S IPisacall  con trol protocolu sedin an IP network presc ribed  b y  RFC 32 61 to  conduc t  m u l tim ed ia  co mm u ni catio nsusing v arious voi ces ,data, images ,  a nd the lik e.On the other  ha nd, T. 38  is one o f I TU-Trecomm e ndatio ns and is  a standa r d which p re scri bes a method fort ra n slating facsim ile si gn a ls u sed  in  a subscri be r tel e phone n e tw o r k  in t o IP messages  for use in com munica ti ons . 
Known  exam pl e s o f such an I P fa csimile m achine include one whi ch has  amul ti-s e ss io n f un c tio n  c apa b leof condu ct in g mul tipl e x e d  com mun icat ionsusing an IP n etw orka ndcan s imult aneo us ly pr ocessIP fa cs imile transmiss ionand recep tio ninmu ltipl e x mode  us ing  the IP  networ k .
W he r e a sconventional G3 fa cs i m il e machin es hav e  a  p l uralityof  ph ysic a l  line s in or der to c onnect to  m ultiple  l ines a nd  ca nno t con d uctcommun ications  unle s s each of thep hysical lines ha s ap hone  nu mber, the I P fa c simi le m a ch ine can p erfor ms im u ltaneous processing  i n mult iplex  mode, once c onnected t o t he IP ne twor k  u s ing a single p hysic al network cable. A lso,the IP f acsimilem a chine ca n p erf orm  si m u lt aneous proces s i ng u si ng a si ngl e phone  nu mbe r.Aswi th the G3  facsimi le  m ac hi ne,  even the IP f ac sim il e m achin e  has a  prob lemin  t h atall ses s io n s  can  b eoccu pie dby fa x tr a nsm ission,  disablin g f a x re ce pt ion.
To  deal with th is  problem,atec hnique i s knownwhich allows a transmit - only se ssi on or  rec eive-only  se ssiontob e spec ifiedwithre spe c t  to e a c hcom mu nicationss e ssi on. W it h th is tech nique, each sessio n  is  set to be ei the r at r an smi t -o n lyse s sio n or a receive-on ly session  i n  a dvance, an d  wh en  thereis a ca ll-ou t  reques t or call -in reque st , on l y  fa x transmis sion isassignedt o the tr ansmi t-o nly se ss ion  andonly f a x r ecept ion is  a ssigne d toth e receiv e-only session with ref erence  to t hesettingsdes c rib ed above(see , for exam ple , J apane seL aid-O penP at ent Publi cati o n (Kokai) No . 2 0 0 4- 112515).
Ho w e v er,  with  th e  facsi mile  machine disclose d  in Japanese L aid- O p enPat e nt P ub lication (Koka i)No . 2004-112 51 5, if, forexample,  t w o ses sionsare av ailable a nd one of  the m i s set tobetr a nsmit-o nl yw hile t he o th er isset to be r e c eive-only, evenif th e r e isa n i nboun dcall wh e n afax is bei ng received  using  the  rece ive-onl ysessio n,th e other se s sion is t ransm it-only ,andnat urally  can n o t beused  f orfax recep t i on . 
I na  bu sine ss en ga gedin receiv i ng order s u s ing fac si mil e ,  since ca l l s are rece ive d fre q u ently, one want s  t o  useboth s ession s for f a x r ec eption
 by_replacing the_G3 facsimile machine. SIP_is a_call_control protocol_used_in an IP_network prescribed by_RFC 3261 to conduct_multimedia communications using_various_voices, data, images, and the like. On the other hand, T.38 is one of_ITU-T_recommendations and_is_a_standard which prescribes a method_for translating facsimile signals used_in a_subscriber telephone network into IP messages for use_in_communications.
Known examples of_such an IP facsimile machine include one which has_a multi-session function capable of conducting_multiplexed communications using_an_IP_network and can simultaneously_process IP facsimile transmission and reception_in multiplex mode using the IP_network.
Whereas conventional G3 facsimile machines have a_plurality of physical lines in order_to connect to multiple lines_and cannot_conduct communications unless each of_the physical lines_has a_phone number, the_IP facsimile machine can perform simultaneous_processing in multiplex_mode, once connected to the IP_network_using a single_physical_network_cable. Also,_the IP facsimile_machine_can perform_simultaneous_processing using a single phone number.
As_with_the G3 facsimile machine, even the IP_facsimile machine has a_problem_in that all sessions_can be occupied by fax_transmission, disabling fax reception.
To deal with_this problem,_a technique_is known which allows a transmit-only session or receive-only session to_be specified with respect to each_communications session. With this_technique, each_session_is set to_be_either a_transmit-only session or a receive-only session in_advance, and_when there is a call-out request_or call-in request, only_fax_transmission is assigned to the transmit-only_session and only fax reception is_assigned to the receive-only session_with_reference_to the settings described above_(see, for example, Japanese Laid-Open Patent_Publication (Kokai) No._2004-112515).
However, with the facsimile machine disclosed in_Japanese_Laid-Open Patent Publication (Kokai) No. 2004-112515,_if,_for example, two sessions are available_and_one_of them is set to_be transmit-only while the other is_set to be receive-only, even if there is an_inbound call when_a fax is being received_using_the_receive-only session, the other session is transmit-only, and naturally cannot_be used_for fax reception.
In_a business engaged in receiving orders using facsimile, since calls_are received frequently, one wants to use_both sessions for fax reception