Abstract: Disclosed is a method and system to help avoid performing third-party registration of a UE with an SMS gateway of an IMS, the IMS including a P-CSCF, an S-CSCF, and an HSS. In an example implementation, when registering for service with the IMS, the UE provides UE-capability data to the P-CSCF, the P-CSCF sends the data to the S-CSCF, and the S-CSCF sends the data to the HSS. The S-CSCF does not send the UE-capability data to the SMS gateway. Rather, when the SMS gateway receives a request to send an SMS message to the UE, the SMS gateway queries the HSS to obtain the UE-capability data. Based on the UE-capability data, the SMS gateway makes a determination of whether the UE is capable of receiving SMS messages over IP and routes the SMS message over an appropriate access network based on the determination.

Abstract: A dc-to-dc converter circuit for generating an output voltage from a source voltage includes a plurality of first metal oxide semiconductor field effect transistors (MOSFETs) connected in parallel and collectively defining a gate, a source and a drain. A driver circuit preferably includes a bipolar transistor connected to the gate for turning on the first MOSFETs. A second MOSFET is preferably connected to the gate for turning off the plurality of first MOSFETs. The dc-to-dc converter also preferably includes a clamp circuit connected to the plurality of first MOSFETs across the drain and source thereof. Protection, soft-start and status features are also preferably incorporated into the dc-to-dc converter. A voltage divider is connected to a reference voltage for dividing a first reference voltage to thereby generate a second reference voltage less than a desired output voltage.