Section: 5.3.4.2.1 Mobile Originating Establishment
Content: The service is requested by the originating mobile station by transferring a SETUP message to the network containing the BC repeat indicator IE, the bearer capability 1 information element, and the bearer capability 2 information element. The first mode of operation ("call mode") shall be indicated by the bearer capability 1 information element and the second call mode by the bearer capability 2 information element. A low layer compatibility may optionally be specified for each call mode in a low layer compatibility I and low layer compatibility II information element. In that case: - the SETUP message shall contain the LLC repeat indicator IE and both low layer compatibility I and low layer compatibility II information elements. The low layer compatibility I information element then corresponds to the bearer capability 1 information element and the low layer compatibility II information element to the bearer capability 2 information element; - if no low layer compatibility specification applies for one of the two call modes, the corresponding low layer compatibility IE (low layer compatibility I or low layer compatibility II) shall indicate "not applicable"; - the LLC repeat indicator shall specify the same repeat indication as the BC repeat indicator IE. Similarly, a high layer compatibility may optionally be specified for each call mode in a high layer compatibility i and high layer compatibility ii information element. In that case: - the SETUP message shall contain the HLC repeat indicator IE and both high layer compatibility i and high layer compatibility ii information elements. The high layer compatibility i information element then corresponds to the bearer capability 1 information element and the high layer compatibility ii information element to the bearer capability 2 information element; - if no high layer compatibility specification applies for one of the two call modes, the corresponding high layer compatibility IE (high layer compatibility i or high layer compatibility ii) shall indicate "not applicable"; - the HLC repeat indicator shall specify the same repeat indication as the BC repeat indicator IE. The receiving entity shall ignore whether the LLC repeat indicator IE or HLC repeat indicator are contained in the message or not; it shall also ignore the repeat indication of an LLC repeat indicator IE or HLC repeat indicator IE. If the low layer compatibility II IE is not contained in the message and the low layer compatibility I IE is contained in the message, the receiving entity shall relate it to a call mode indicated in the message that does not specify speech (if any). If the high layer compatibility ii IE is not contained in the message and the high layer compatibility i IE is contained in the message, the receiving entity shall relate it to a call mode indicated in the message that does not specify speech (if any). The specific part of the network which is sensitive to the call mode shall examine each mode described in the bearer capabilities included in the SETUP message by performing compatibility checking as defined in Annex B. If as a result of this compatibility checking the network decides to reject the call, then the network shall initiate call clearing as specified in subclause 5.4 with the following causes: a) #57 "bearer capability not authorized"; b) #58 "bearer capability not presently available"; c) #65 "bearer service not implemented"; d) #70 "only restricted digital information bearer capability is available".