Introduction A teleservice is a mechanism for information delivery from a source to a destination through a BMI. The source may be a mobile station or a Teleservice Server (TS). Ateleservice may be delivered in point-to-point mode or broadcast mode. It may be textbased@ such as Cellular Messaging Teleservice (CMT)@ or it may be coded informationdestined for the mobile station's storage and use@ such as Over-the-Air ActivationTeleservice (OATS) and Over-the-Air Programming Teleservice (OPTS). Theinformation delivered from the source to the destination is known as user data. A teleservice message is delivered across the TIA/EIA-136 air interface on a DCCH orDTC inside a layer 3 R-DATA message or@ on a PDCH inside a tunneled layer 3 R-DATA message (see TIA/EIA-136-376) and across the TIA/EIA-41 network interfaceinside a layer 3 Short Message Delivery Point-to-Point (SMDPP) Invoke message. Thedelivery of the layer 3 message may be acknowledged by the destination in a TIA/EIA-136 R-DATA ACCEPT or R-DATA REJECT message and a TIA/EIA-41 SMDPPReturn Result message. Teleservice Segmentation and Reassembly (TSAR) may beapplied to the user data to allow for end-to-end delivery of messages and informationwhich cannot fit inside a single R-DATA or SMDPP Invoke message. Figure 1 shows theTeleservice Protocol Stack for operation with TIA/EIA-136 between TIA/EIA-41. A teleservice message may also be delivered across the TIA/EIA-136 air interface on aPDCH inside an SM-RL RP-DATA message (see TIA/EIA-136-670)@ across the GSMnetwork inside an FSM message and across the TIA/EIA-41 network interface inside alayer 3 Short Message Delivery Point-to-Point (SMDPP) Invoke message. The delivery ofthe teleservice message may be acknowledged by the destination in a SM-TP message. Teleservice Segmentation and Reassembly (TSAR) may be applied to the user data toallow for end-to-end delivery of messages and information which cannot fit inside a singleSM-TP or SMDPP Invoke message. Figure 2 shows the Teleservice Protocol Stack foroperation among TIA/EIA-136 200kHz channels@ SGSN network@ and TIA/EIA-41network. A teleservice is uniquely identified across the TIA/EIA-136 air interface by a HigherLayer Protocol Identifier (HLPI)@ and across the TIA/EIA-41 network interface by aSMS_Teleservice Identifier. There is a one-to-one mapping between the TIA/EIA-136HLPI and the TIA/EIA-41 SMS-Teleservice Identifier. The BMI provides theinterworking between the Teleservice Server and the mobile station by translating 34 between the TIA/EIA-136 and TIA/EIA-41 protocols. The BMI is not required to processthe user data portion of a teleservice beyond providing protocol translation.