1、INTERNATIONAL TELECOMMUNICATION UNION)45G134 $ TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU#(!2).G0G0!.$G0G0!#/5.4).G0G0).G0G0).4%2.!4)/.!,4%,%#/-5.)#!4)/.G0G03%26)#%3#(!2).G0G0!.$G0G0!#/5.4).G0G002).#)0,%32%,!4).G0G04/G0G04(%G0G053%2G0G13G04/G0G13G053%2).(b) that a limited volume of user-to-user i
2、nformation may be exchanged over the signalling channel during thecall set-up phase, even if a call subsequently fails to mature on the information channel B-channel(s);(c) that user-to-user information may also be exchanged over the signalling channel throughout the duration ofa call over the infor
3、mation channel;(d) that the exchange of user-to-user information over the signalling channel will occupy channel capacity,involve a degree of processing and will impact on signalling network dimensioning, and thereby represent an additionalcost to Administrations;(e) that the possibility to exchange
4、 user-to-user information over the signalling channel represents anadditional, and chargeable supplementary service within ISDN for customers,and recognizing(a) that although collection charges are essentially a national matter, a harmonised approach towards chargingand accounting principles is desi
5、rable;(b) that initially, the volumes of traffic are likely to be small, and a flexible approach towards the options forraising a charge for this supplementary service is desirable until traffic patterns are established and experience gained,recommends1 Charging principles1.1 User-to-user informatio
6、n exchanged over the signalling channel during call set-up and clear down as well asduring clear set-up only, should be charged by one of the following methods:a) by inclusion in the subscription or rental charges raised against customers;b) by setting an appropriate minimum call charge for communic
7、ations originated over the informationchannel;c) by a per call fee1)(for further study);d) when appropriate, by a combination of methods a) and b) or a) and c) above;_1)In principle, this charge should not apply to unsuccessful call attempts due to congestion or a fault in the Administrationsequipme
8、nt.2 Fascicle II.1 - Rec. D.231e) for the user-to-user information exchanged during call set-up it may also be appropriate to chargeaccording to the volume of information exchanged.2), 3)1.2 User-to-user information exchanged over the signalling channel while a call is in progress over the informati
9、onchannel should, in principle, be charged according to the volume of information (data) exchanged over the signallingchannel.2), 3)2 Accounting2.1 To minimise the costs associated with recording and processing, it is desirable that the traffic units used foraccounting purposes should be compatible
10、with those used for customer charging.2.2 User-to-user information exchanged over the signalling channel during call set-up and clear down or duringset-up only should be accounted for by one of the following methods to be agreed between Administrations, as asupplement to the normal accounting rates
11、for the bearer service, or teleservice, with which the user-to-userinformation supplementary service is associated:a) a monthly flat rate (for further study),b) a per call rate.2.3 User-to-user information exchanged over the signalling channel while the associated bearer service orteleservice commun
12、ication is in progress should, in principle, be accounted for according to the volume of informationexchanged over the signalling channel. Alternatively, Administrations may agree to adopt the method 2.2 a) or b)above for this category of user-to-user information.2.4 The accounting rate established
13、by agreement between Administrations should be divided into terminal sharesand, when appropriate, into transit shares.2.5 Administrations may bilaterally agree not to account for user-to-user information service (or mode)._2)The determination of the volume unit is for further study. One simple solut
14、ion would be to charge for the number of user-to-userdata blocks exchanged.3)In practice, the introduction of a charge will be determined by the extent to which user-to-user information actually will beexchanged, and initially at least, Administrations may deem the facility to be covered by the normal bearer service or teleservicecharges, or by the subscription or rental charges raised against customers.
