Nemotion is partly a competitior of Birdstep. They don`t have the complete solution as Birdstep have and the client can be integrated in a Nemotion offer. Netmotion also collabarate with a company called I-Care.
Nortel deliver to carriers and will therfore sell the Mobile IP client to carriers who will sell to end users. The Client can be sold separate or included in a bigger package.