Section: B.2.2 Compatibility/Subscription checking of the SETUP message
Content: At the calling side the network shall check that the basic service(s) requested by the calling MS in the Bearer Capability information element(s) match(es) with the basic services provided to that subscriber by the PLMN. If for at least one bearer capability information element contained in the SETUP message a mismatch is detected, then the network shall proceed as follows: - if the SETUP message contained two bearer capability information elements for only one of which a mismatch is detected, the network shall either: - under the conditions specified in 3GPP TS 27.001[ General on Terminal Adaptation Functions (TAF) for Mobile Stations (MS) ]  [36] (e.g. TS 61 and TS 62), accept the SETUP message with a CALL PROCEEDING message containing the, possibly negotiated, bearer capability information element for which no mismatch is detected, or - reject the call using one of the causes listed in annex H. - otherwise the network shall reject the call using one of the causes listed in annex H. Network services are described in 3GPP TS 22.002[ Circuit Bearer Services (BS) supported by a Public Land Mobile Network (PLMN) ]  [3] and 3GPP TS 22.003[ Circuit Teleservices supported by a Public Land Mobile Network (PLMN) ]  [4] as bearer services and teleservices, respectively.