name: MMTEL
full_form: Multimedia Telephony
context: The MS: - shall not send any user data; - shall initiate routing area updating procedure on the expiry of timers T3311, T3302 or T3346; - shall initiate routing area updating procedure when entering a new PLMN, if timer T3346 is running and the new PLMN is not equivalent to the PLMN where the MS started timer T3346, the PLMN identity of the new cell is not in one of the forbidden PLMN lists and the location area this cell is belonging to is not in one of the lists of forbidden LAs; - shall initiate routing area updating procedure when the routing area of the serving cell has changed, if timer T3346 is not running, the PLMN identity of the new cell is not in one of the forbidden PLMN lists and the location area this cell is belonging to is not in one of the lists of forbidden LAs; - shall, if entry into this state was caused by b) or d) with cause "Retry upon entry into a new cell" of subclause 4.7.5.1.5, initiate routing area updating procedure when a new cell is entered; - shall, if entry into this state was caused by c) or d) with cause different from "Retry upon entry into a new cell" of subclause 4.7.5.1.5, not initiate routing area updating procedure when a new cell is entered; - shall use request for non-GPRS services from CM layers to trigger the combined routing area updating procedure, if timer T3346 is not running and the network operates in network operation mode I. Depending on which of the timers T3311 or T3302 is running the MS shall stop the relevant timer and act as if the stopped timer has expired; - may use a request for an MMTEL voice call or MMTEL video call from the upper layers to initiate routing area updating procedure (Iu mode only), if timer T3346 is not running; - may initiate routing area updating procedure upon request of the upper layers to establish a PDN connection for emergency bearer services (UTRAN Iu mode only); - shall initiate routing area updating procedure upon request of the upper layers to establish a PDN connection without the NAS signalling low priority indication as specified in subclause 4.7.5.1.5, item j), if timer T3346 is running due to a NAS request message (ROUTING AREA UPDATE REQUEST or SERVICE REQUEST) which contained the low priority indicator set to "MS is configured for NAS signalling low priority" and timer T3302 and timer T3311 are not running; - may detach locally and initiate GPRS attach for emergency bearer services even if timer T3346 is running; - shall initiate routing area updating procedure in response to paging; and - shall not initiate the signalling procedure for GPRS detach unless the routing area of the current cell is same as the stored routing area. Optionally, the MS may perform local GPRS detach.
description: The Multimedia Telephony (MMTEL) is a service that provides multimedia communication capabilities.
explanation: Classified as a Service because it represents a type of telecommunications offering.
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